Just a suggestion, I'm not sure whether it would be best in this area, but are car magnets available?  I think the vast majority of people are done with bumper stickers are looking to go to the car magnet route in order to keep things fresh, update the sticker layouts, etc.  I know how to convert bumper stickers into magnets, but really I think it's the better way to go in the long run.  I'm sure we've all seen sun washed or faded bumper stickers that just look repugnant after a few years.  Going the way of the car magnet is a better option.  Anyone know if these are available and if not, how to pass that suggestion around?

I went to walmart and bought the magnets and put the Ron Paul bumber stickers all over for long trips.  Got some horns honking.  I just started doing this for Barr.