Here is my collection of bumper stickers I made. Don't worry, they look small on the screen but they should print out at bumper sticker size (or you can edit it on any picture reader to be any size you want). What you need to do to make them yours is right click and "save as" to your hard drive.
You'll need to get some big whole sheet Avery labels (or whatever brand) and a few sheets of clear contact paper or sticky laminate. Simply print them out on the label paper, place the clear contact paper over the front and cut to size. ALL DONE! Now they're all yours to stick on your car. *You may also want to print some out to stick on your books, locker, whatever!!*
Happy printing!!