Axelcat and I made this one night playing the Three lines game. Its a bit like Mr. Squiggle only each person adds 3 lines each turn, taking it in turns till everyone see's a picture and reckons its done.
We think it might be some cat/dragon thing, noming on the head of a gas mask wearing (tooth paste tube?) fish creature wearing a jacket..

UV is very hard to take pictures of by the way.. It looks much more intense with the naked eye under UV.