Caveat 1: One sticker has a "swear word" on it, and a couple others express opinions that are potentially offensive.
Caveat 2: The last bumper sticker on the page ("devil inside") is not by me.
Caveat 3: I actually don't take the messages on these bumper stickers very seriously, so if you ask me about them, I might explain some weird logic on my part that led me to write that, or I might just giggle.
BumperActive.com is a very cool business model. You can design your own bumper stickers on their website and put them up for sale there; your only cost is purchasing a copy of the sticker you make.