Some of you may remember this from a while back. It's a crappy pallet hack I made in 3 minutes. I am amazed that I still have it. (too bad I didn't keep my Quackshot hack....) ROM
(I change all the Donald sprites into Sonic, and other various art throughout the ROM. It was easy because the game uses lots of Nemesis compressed art, and I added Quackshot support to Sonik Sprite) However, I was not happy with it, there were little things that weren't quite perfect. So I deleted it and stopped working on it. (at the time, I didn't think anyone would care about it...)