1st - Adam Z, is that Nibbler?!?! Love it!
2nd - I'm so confused when it comes to copyright stuff. Like I'm using a TARDIS in my banner and avatar but I'm not selling any of my designs with any copyrighted images. I purchase the things I can't make myself and make sure they are available for commercial use. The whole copyright thing is a really grey area for me. I see so many things that look like they could be infringing but I dunno.