There's an art exhibition right now in New York City with relevance to Second Life. They're featuring the "13 most beautiful avatars" there on big, big prints.
They're featuring only portrait shots of them, digitally printed out on 36x48 inch canvas (that's 91,4 x 121,9 cm, folks). So the things are quite big, you could buy it and hang it over your fireplace, bed, whatever.
Frankly, I don't know how they were chosen, it seems the taste of the photographers was the judge on it. Some of the avatars, like Aimee Weber, are really well known and I think it's at least for her more about branding herself and her name than anything else. I also know more beautiful avatars than those on the exhibition, but that's just my taste, of course and YMMV, like always.
Frankly said, I would not buy such a portrait and hang it anywhere; instead I would try to spot them and make a photo of them myself (haha, just kidding). Well, I spotted Aimee Weber a while ago in the Avastar building, in which she was evolved - whatever.
No, but really I would buy - if so - or print something from the IRTC instead. For example, something like this picture here. They all have a more aesthetic value than anything that can be taken on SL at all, since it's about raytracing there.