Skins for the Masque mod. You MUST have Masque for this to work!
Two skins - one with a plain, square backdrop, the other with a puzzle piece shaped backdrop that fits with itself horizontally and vertically.
Nothing fancy for installation, simply download the file, and extract it to your World of Warcaft\Interface\AddOns folder.
Many thanks to JJ Sheets for creating ButtonFacade, and to StormFX for continuing it.