I don't like to put bumper stickers on cars because I would actually have to put it on the bumper. However, when we bought our mini-van I became a bumper sticker lover!
Vans have a few spots on the back windows where bumper stickers fit quite nicely, which is nice because stickers can be taken off of glass quite easily.
I had a sticker made up and liked it so much that I ordered 88 of them! LOL Needless to say, many of my homeschooling friends have them on their vehicles now.
I am in the mood to make more bumper stickers! We now have a 15 passenger van so there is more room on the back windows! LOL