Thanks to the decompressing magic of Tahaxan (http://tahaxan.freehostia.com/), more prototype Super Princess Peach sprites have been found! How they can be used in a fan game is beyond me, though.
Remember the old Waluigi that I made? And I said I would make a better version?Well this is the most complete, custom spritesheet that I made. Has all power-ups, including an unused, metal cap.