Yeah, it's the cover of the album "Doolittle" by Pixies (who are an 80's alternative rock band). The picture is of a monkey with a halo above it's head. One of my favourite album covers too. I might go back to using it as my avatar if I can't find anything else, since I used it for so long and like being consistent.
By now though, I've grown used to seeing you with it, ha ha.