For a while I've been trying to replace the default Blizzard textures in the Interface folder with 'empty' textures - textures with the same size, but simply completely transparent, so the end result appears without any visible textures at all. Then, I'd simply add a custom frame in lua with a background and boom, restyled the Blizz frames.
Thing is though, I'm not good with Photoshop and Gimp. No matter what I do, when I make the textures fully transparent, they always appear in solid green ingame. I think I'm doing something wrong with the format, but I've no clue.