I have in the past ... Nothing right now, but I want to have a couple made.

One will be political and state ... NOBODY FOR NOTHIN'.

The other one will be for all the reckless drivers out there that probably can't read anyhow or simply won't get it or care anyway ... It will state ...
YOUR HURRY SHOULDN'T BE EVERYBODY ELSES WORRY.

Oh, and maybe one for Christmas that states ... BE NICE, SANTA'S COMING.

PS ... If you're concerned about the bumper stickers messing up your chrome or paint, put them on the back windows ... That way if you decide to remove them, you can clean the glass and there will be no lasting damage.