Some other cool stickers I've seen around the web, while I wait for an original idea to visit me in a dream...
"Sortaflush / Stance is something" and/or "Cantflush" with a toilet plunger... or a toilet sillouette with "Flush"
An image of a rake for those of you with a tilted suspension.. (I had one of these. Now I just have a smushed car.
One of those support the troops / breast cancer / whatever ribbons with "Save the Oilpans"
"I'm not unemployed, I'm NSFW"
Finally, I totally want one of those WWF logos with the panda bear, and then the other panda bear behind him ready to hit him with a steel chair.
It sounds stupid when I write it out, but I lol'd the first time I saw it.
Hell they all sound pretty stupid when I write them out. Whatever.