sticker I would put on my car. For anything. I would put a front plate of something except we have front license plates in Texas, and window stickers for the back are fine, but I don't think I actually want a bumper sticker uglying up my car these days. Never really thought about it before, but I haven't had one in ten years probably.
it may be more because I haven't seen a good looking bumper sticker in that time. But they also eventually halfway peel off and fade and look like ****.