If it only shows some green stuff - its due to it not finding the file, check the patch again and notice that it swapped its way of writing it, from \\ to / (someone please correct me if im wrong)
So it would be something along these lines /interface/addons/YOURARTFOLDER/YOURARTNAME.tga
This is what i remeber from being away from my pc, will check when i get home
When entering the path to your custom artwork, you must use \\ as folder separators, as well as starting the path with \\. To specify an image path using an example you'd enter: \\Interface\\AddOns\\textures\\Chatbox.tga