A couple of years ago I did a little project to raise money for WWF, where I supported their campaign to save wild tigers from extinction by drawing a tiger every day for a month and encouraging my friends to do the same. It was a really fun thing to do and it got quite a nice response, and I still keep adding little tiger-inspired pics to the collection now and again.
After recently working on a How To Draw Manga book for Arcturus, I used some of the characters I'd drawn, changed them a bit and added tigery colours to them.