I saw a great one here in KC the other day. Red Prius with a "Blackshirts" magnet on both front doors as well as a N magnet between front doors and front tire. The personalized plate was something to the effect of "GOBGRED".
I tried to take a picture of it while it was leaving the parking lot but was not quick enough. I even followed it for a bit hoping to pull up next to it at a stop light...after a couple of blocks I felt creepy and gave up.