There's artist tags for that, started by tagging artist:(name) in one post and using (name) in other posts. One should check to see if it's used already before they do so; you may have to add "_(artist)" for certain authors.
blarginator said: Zeovalguar. Just wonderning if you've asked permission from the original artist to use his/hers artwork in your wallpapers?
Same idea came to me as well. I'm pretty sure the person didn't make the art used(seeing as I see the wallpapers on a club on DA all the time.) It would be better off as a pool than a tag.