Val(erie)Hallen has produced some backgrounds from his Clan Crypt of his pretty fucking awesome Rock v. Techno UT2k4 map.
Go here:
http://sv4.3dbuzz.com/clanUED/blogs/index.php?blog=17
also, there's a small movie in the works for those who want a taste of the map without having to download the full thing... but then after seeing the movie you'll download it anyways...