If you go to user CP at the top left hand corner on the page your user control panel will drop down on as a tab on the left hand side. There you have the option to "edit avatar". We have the ones from the old site still, but we're working on bringing in some new ones which will be available in a few days. You also have the option to upload your own avatar.
Unless you meant the thumb nails on the side of WIP's, let me know if that's it.