I voted down, for two reasons :

1 - Ubuntu is a very commercial distribution, the exact opposite of the Free software spirit. It's made for Windows and Mac users, not for GNU/Linux users.
2 - here is GNOME-LOOK.ORG, not ubuntu-art. Are really Ubuntu users so stupid that they do not understand that Gnome users are NOT ubuntu users?
Go on ubuntu-art to share your ubuntu wallpapers, gnome-look is not the right place at all ;)

How the hell do you figure Ubuntu is commercial
Oxford definition of commercial:
Pronunciation:/kəˈməːʃ(ə)l/
adjective

1 concerned with or engaged in commerce:a commercial agreement
2 making or intended to make a profit:commercial products
having profit rather than artistic or other value as a primary aim:their work is too commercial

I fail to see how ubuntu fits this.
Is it because canonical supports it? (the company that is lucky if it breaks even each year) Does that mean Fedora is out because it's sponsored by Red Hat and also Open SUSE sponsored by Novell, and possibly even Debian since Ubuntu has donated funds?
And so what if Ubuntu converts windows and mac users, is this not a good thing?

Your second point is twisted logic, a fallacy, he is not suggesting all gnome users are ubuntu users but ubuntu uses gnome (else it's kubuntu, xubuntu etc)
so it does fit in on gnome-look.

Anyway petty arguments aside, I think it's a fine collection of wallpapers I voted up.

(And I know I'm just feeding a troll here, but hey there's only so much crap I can stand reading from one person)

I am not agree, in first place because the name of the site says gnome, and ubuntu use it, so ubuntu users are in fact gnome users, but maybe the majority of them doesn't even know.
And second I never seen a rule that says Ubuntu artwork isn't permitted, I didn't even know that there was a page for Ubuntu users, I been here for years looking for eye-candy for my Ubuntu.

It looks like gnome-look has some conservative users because it is older than the Ubuntu distro, all changes could cause fear. Maybe this is one.

If you have the link for any rule that this art is broking please let me know.

A better comment for justifying your vote could be because you just don't like it.

I like the wallpaper that are in the middle, the one with it just stand ubuntu on! very nice! :-)