Those are nice! You're really enjoying MakersPlace aren't you :)
I've seen some of those virtual art gallery type things before, got a friend who is very into SecondLife and...there was another one but I can't remember. Anyway they've had a few art exhibit things on it that were kind of like that.
Yea, I'm digging it, and I'm selling stuff so there's that. Definitely seems like something that has potential.