Yep - I think they are yellow. I used to work for the guy who started all the "vanity" license plates. The original vanity tag was to honor and remember the 7 astronauts from the 28 Jan. 1986 Challenger accident. From there all kinds of interest groups jumped on it - we have all the college tags, florida panther, mosquito lagoon, manatee, right to life, etc.
I would like to see a confederate florida tag - I made my own with a little square CBF sticker on the corner of mine!