What can I get for my roller derby girlfriend?

My girlfriend is a roller derby girl and I'm trying to find some cute gifts for her for Christmas. I was trying to find maybe a stuffed bear or cat on roller skates, but nobody seems to make such a thing. I even tried the Vermont Teddy Bear site, but they had nothing. What are some cute ideas and where can I find them. I'm looking to spend around $50 or so, so I'd like to get her more than band-aids or socks. Any ideas would be greatly appreciated.