A few people have figured out that you can go to www.wincustomize.com and create an avatar that will show up on this site. It is actually a code bug that the programmers have left. If it is abused, it will go away, however.
With that, I need to remind people that you are actually uploading to wincustomize. With that, you are doing so under the terms of Wincustomize. One of the terms of use states: "(a) upload, post or otherwise transmit any Content that is unlawful, harmful, threatening, abusive, harassing, tortuous, defamatory, vulgar, obscene, pornographic, libelous, invasive of another's privacy, hateful, or racially, ethnically or otherwise objectionable;". It also states: "Stardock and its designees shall have the right to remove any Content that violates the TOS or is otherwise objectionable."
Avatars are moderated by Wincustomize. If you use an avatar that could be considered "hateful", Wincustomize moderators and admins have the right to request its removal or remove it. If you abuse the avatars, you will be banned from Wincustomize and will no longer have access to it. Wincustomize has high standard of conduct (much higher than JU), so please keep that in mind when uploading an avatar.