On most of the UT forums I'm a member of I've either started screenshot threads, or heavily contributed to existing ones. Toyed with starting one on this forum... but as things are a bit more official here I've avoided it.
Mild exception to this one thing, a map someone else made I think is worth checking out.
http://www.ut99.org/viewtopic.php?f=5&t=5031
You can download it from there.
Really well done, very creative.
Alice In Wonderland themed.
The White Rabbit actually helps you fight the monsters!