Something with UI's images got borked.

Also, using custom image_button background images is not necessary.

mods/default/init.lua

@@ -20,9 +20,9 @@ minetest.register_on_joinplayer(function(player)
 			listcolors[#FFFFFF30;#B0B0B0;#606060;#A0A0A0;#FFF] 
 			style_type[button;bgcolor=#B0B0B0FF] 
 			style_type[button_exit;bgcolor=#B0B0B0FF] 
-			style_type[image_button;bgcolor=#B0B0B0FF] 
+			style_type[image_button;bgcolor=#B0B0B0FF;border=false] 
-			style_type[image_button_exit;bgcolor=#B0B0B0FF] 
+			style_type[image_button_exit;bgcolor=#B0B0B0FF;border=false] 
-			style_type[item_image_button;bgcolor=#B0B0B0FF] 
+			style_type[item_image_button;bgcolor=#B0B0B0FF;border=false] 
 			style_type[scrollbar;bgimg=#808080FF;fgimg=#606060FF;border=true] 
 	      ]]
 	local name = player:get_player_name()

mods/dreambuilder_extras/customize-dreambuilder-game.sh

@@ -248,9 +248,9 @@ sed -i 's/"field\[.*")/ \
 sed -i "s/listcolors\[.*\]/listcolors[#FFFFFF30;#B0B0B0;#606060;#A0A0A0;#FFF] \
 \n\t\t\tstyle_type[button;bgcolor="$btn_color"] \
 \n\t\t\tstyle_type[button_exit;bgcolor="$btn_color"] \
-\n\t\t\tstyle_type[image_button;bgcolor="$btn_color"] \
+\n\t\t\tstyle_type[image_button;bgcolor="$btn_color";border=false] \
-\n\t\t\tstyle_type[image_button_exit;bgcolor="$btn_color"] \
+\n\t\t\tstyle_type[image_button_exit;bgcolor="$btn_color";border=false] \
-\n\t\t\tstyle_type[item_image_button;bgcolor="$btn_color"] \
+\n\t\t\tstyle_type[item_image_button;bgcolor="$btn_color";border=false] \
 \n\t\t\tstyle_type[scrollbar;bgimg="$scrollbar_color";fgimg="$scrollbar_handle_color";border=true] \
 \n\t      ]]/" \
        $workdir"/mods/default/init.lua"
@@ -260,7 +260,7 @@ sed -i 's/"style_type\[.*\]"/"style_type[label,textarea;font=mono]" \
 \t\t.."bgcolor['"$form_bgcolor"';false]"/' \
        $workdir"/mods/mesecons_luacontroller/init.lua"
 
-sed -i 's/local n = 4/formspec[4]="style_type[image_button;bgimg=standard_image_button.png;bgimg_hovered=standard_image_button_brighter.png]" \
+sed -i 's/local n = 4/formspec[4]="style_type[image_button;bgcolor='"$btn_color"']" \
 \tlocal n = 5/' \
     $workdir"/mods/unified_inventory/internal.lua"
 

mods/unified_inventory/bags.lua

@@ -7,22 +7,24 @@ License: GPLv3
 
 local S = minetest.get_translator("unified_inventory")
 local F = minetest.formspec_escape
+local bags_inv_bg_prefix = "image[-0.1,1.0;10.05,"
 
 unified_inventory.register_page("bags", {
 	get_formspec = function(player)
 		local player_name = player:get_player_name()
 		return { formspec = table.concat({
-			"background[0.06,0.99;7.92,7.52;ui_bags_main_form.png]",
+			string.gsub(unified_inventory.standard_inv_bg, "YYY", "4.4"),
+			bags_inv_bg_prefix.."1.175;ui_bags_header.png]",
 			"label[0,0;" .. F(S("Bags")) .. "]",
-			"button[0,2;2,0.5;bag1;" .. F(S("Bag @1", 1)) .. "]",
+			"button[0,2.2;2,0.5;bag1;" .. F(S("Bag @1", 1)) .. "]",
-			"button[2,2;2,0.5;bag2;" .. F(S("Bag @1", 2)) .. "]",
+			"button[2,2.2;2,0.5;bag2;" .. F(S("Bag @1", 2)) .. "]",
-			"button[4,2;2,0.5;bag3;" .. F(S("Bag @1", 3)) .. "]",
+			"button[4,2.2;2,0.5;bag3;" .. F(S("Bag @1", 3)) .. "]",
-			"button[6,2;2,0.5;bag4;" .. F(S("Bag @1", 4)) .. "]",
+			"button[6,2.2;2,0.5;bag4;" .. F(S("Bag @1", 4)) .. "]",
 			"listcolors[#00000000;#00000000]",
-			"list[detached:" .. F(player_name) .. "_bags;bag1;0.5,1;1,1;]",
+			"list[detached:" .. F(player_name) .. "_bags;bag1;0.5,1.1;1,1;]",
-			"list[detached:" .. F(player_name) .. "_bags;bag2;2.5,1;1,1;]",
+			"list[detached:" .. F(player_name) .. "_bags;bag2;2.5,1.1;1,1;]",
-			"list[detached:" .. F(player_name) .. "_bags;bag3;4.5,1;1,1;]",
+			"list[detached:" .. F(player_name) .. "_bags;bag3;4.5,1.1;1,1;]",
-			"list[detached:" .. F(player_name) .. "_bags;bag4;6.5,1;1,1;]"
+			"list[detached:" .. F(player_name) .. "_bags;bag4;6.5,1.1;1,1;]"
 		}) }
 	end,
 })
@@ -47,26 +49,27 @@ for bag_i = 1, 4 do
 			local stack = get_player_bag_stack(player, bag_i)
 			local image = stack:get_definition().inventory_image
 			local fs = {
+				string.gsub(unified_inventory.standard_inv_bg, "YYY", "4.4"),
 				"image[7,0;1,1;" .. image .. "]",
 				"label[0,0;" .. F(S("Bag @1", bag_i)) .. "]",
 				"listcolors[#00000000;#00000000]",
-				"list[current_player;bag" .. bag_i .. "contents;0,1;8,3;]",
+				"list[current_player;bag" .. bag_i .. "contents;0,1.1;8,3;]",
 				"listring[current_name;bag" .. bag_i .. "contents]",
-				"listring[current_player;main]"
+				"listring[current_player;main]",
 			}
 			local slots = stack:get_definition().groups.bagslots
 			if slots == 8 then
-					fs[#fs + 1] = "background[0.06,0.99;7.92,7.52;ui_bags_sm_form.png]"
+					fs[#fs + 1] = bags_inv_bg_prefix.."1.175;ui_bags_inv_small.png]"
 			elseif slots == 16 then
-					fs[#fs + 1] = "background[0.06,0.99;7.92,7.52;ui_bags_med_form.png]"
+					fs[#fs + 1] = bags_inv_bg_prefix.."2.35;ui_bags_inv_medium.png]"
 			elseif slots == 24 then
-					fs[#fs + 1] = "background[0.06,0.99;7.92,7.52;ui_bags_lg_form.png]"
+					fs[#fs + 1] = bags_inv_bg_prefix.."3.525;ui_bags_inv_large.png]"
 			end
 			local player_name = player:get_player_name() -- For if statement.
 			if unified_inventory.trash_enabled
 					or unified_inventory.is_creative(player_name)
 					or minetest.get_player_privs(player_name).give then
-				fs[#fs + 1] = "background[6.06,0;0.92,0.92;ui_bags_trash.png]"
+				fs[#fs + 1] = "image[5.91,-0.06;1.21,1.15;ui_bags_trash.png]"
 						.. "list[detached:trash;main;6,0.1;1,1;]"
 			end
 			local inv = player:get_inventory()

mods/unified_inventory/init.lua

@@ -44,7 +44,10 @@ unified_inventory = {
 	main_button_y = 9,
 	craft_result_x = 0.3,
 	craft_result_y = 0.5,
-	form_header_y = 0
+	form_header_y = 0,
+	standard_background = "background[-0.2,-0.2;1,1;ui_form_bg.png;true]",    -- the 'true' scales to fill, overrides the 1,1
+	standard_inv =        "list[current_player;main;0,YYY;8,4;]",             -- the YYY's are placeholders which get
+	standard_inv_bg =     "image[-0.1,YYY;10.05,4.70;ui_main_inventory.png]", -- replaced later by string.gsub()
 }
 
 -- Disable default creative inventory

mods/unified_inventory/internal.lua

@@ -65,14 +65,14 @@ function unified_inventory.get_formspec(player, page)
 	local formspec = {
 		"size[14,10]",
 		pagedef.formspec_prepend and "" or "no_prepend[]",
-		"background[-0.19,-0.25;14.4,10.75;ui_form_bg.png]" -- Background
+		unified_inventory.standard_background -- Background
 	}
-	formspec[4]="style_type[image_button;bgimg=standard_image_button.png;bgimg_hovered=standard_image_button_brighter.png]" 
+	formspec[4]="style_type[image_button;bgcolor=#B0B0B0FF]" 
 	local n = 5
 
 	if draw_lite_mode then
 		formspec[1] = "size[11,7.7]"
-		formspec[3] = "background[-0.19,-0.2;11.4,8.4;ui_form_bg.png]"
+		formspec[3] = unified_inventory.standard_background
 	end
 
 	if unified_inventory.is_creative(player_name)
@@ -131,7 +131,7 @@ function unified_inventory.get_formspec(player, page)
 	if fsdata.draw_inventory ~= false then
 		-- Player inventory
 		formspec[n] = "listcolors[#00000000;#00000000]"
-		formspec[n+1] = "list[current_player;main;0,"..(ui_peruser.formspec_y + 3.5)..";8,4;]"
+		formspec[n+1] = string.gsub(unified_inventory.standard_inv, "YYY", ui_peruser.formspec_y + 3.5)
 		n = n+2
 	end
 

mods/unified_inventory/register.lua

@@ -171,7 +171,7 @@ unified_inventory.register_page("craft", {
 
 		local player_name = player:get_player_name()
 		local formspec = "background[2,"..formspecy..";6,3;ui_crafting_form.png]"
-		formspec = formspec.."background[0,"..(formspecy + 3.5)..";8,4;ui_main_inventory.png]"
+		formspec = formspec..string.gsub(unified_inventory.standard_inv_bg, "YYY", (formspecy + 3.4))
 		formspec = formspec.."label[0,"..formheadery..";" ..F(S("Crafting")).."]"
 		formspec = formspec.."listcolors[#00000000;#00000000]"
 		formspec = formspec.."list[current_player;craftpreview;6,"..formspecy..";1,1;]"
@@ -268,7 +268,7 @@ unified_inventory.register_page("craftguide", {
 		local player_name = player:get_player_name()
 		local player_privs = minetest.get_player_privs(player_name)
 		local fs = {
-			"background[0,"..(formspecy + 3.5)..";8,4;ui_main_inventory.png]",
+			string.gsub(unified_inventory.standard_inv_bg, "YYY", (formspecy + 3.4)),
 			"label[0,"..formheadery..";" .. F(S("Crafting Guide")) .. "]",
 			"listcolors[#00000000;#00000000]"
 		}

mods/unified_inventory/waypoints.lua

@@ -23,7 +23,7 @@ unified_inventory.register_page("waypoints", {
 		if not waypoints_temp[player_name] then waypoints_temp[player_name] = {hud = 1} end
 
 		local waypoints = datastorage.get(player_name, "waypoints")
-		local formspec = "background[0,4.5;8,4;ui_main_inventory.png]" ..
+		local formspec = string.gsub(unified_inventory.standard_inv_bg, "YYY", "4.4") ..
 			"image[0,0;1,1;ui_waypoints_icon.png]" ..
 			"label[1,0;" .. F(S("Waypoints")) .. "]"