The challenge at the Stampotique Designer's Challenge blog is humorous birthday. I hope this qualifies......I suppose it depends on your stance on clowns, I guess!
He's coloured with Promarkers and the background is one my son made by dripping spray inks. I wrote the Happy Birthday in to fit the space on the cat's back.
I'm also entering this into the Play Date Cafe challenge where the colours are
Slime Green.....Frightful Fuschia...
Putrid Purple...Black as Night