Sony has released a series of LBP avatars, but that's not enough. They haven't released any new ones in a while and would love to have an infamous avatar and more Uncharted ones. They can't honestly be that hard to make.
What avatars do you want to see?
A RockBand logo since I play it about 80% of the time when I'm gaming. Better yet, the instrument icons from the game would be nice (and useful)... I could pick what instrument I'm playing and have a comment to tell others on my friends list to invite if they need to fill that instrument in their band.
My RockBand DLC (Now over 1100 tracks!): http://www.myrockbandsongs.com/War_Lord/