I have donated some to the SPCA, since we bring toys, blankets and food once a month anyway. I have the first collar we got for Gonzo, and the bandana he was wearing when we picked him up, but I don't keep any that he doesn't wear.. I'm not creative, at all!

oh, but sometimes I do make collars for him. . when he was 1 year old, a cut up a studded belt and made it into a collar for him, which was very cool. Right now, he has around 10 collars and a bunch of bandanas and 2 harnesses.