Please let us know what you end up with! I would be particularly curious to see if the DMV will accept a symbols-only plate (like the ++$...$..$. suggestion). I have a feeling they would reject it.

When I got my new car in January, I wanted to get a "PERLMNK" plate (only 7 characters plus a space in Indiana), but when I went to get the plates, I found out that they only issue vanity plates once a year: I would have to place the order and wait until next year, and I'm moving out of the state this year. Agh.

--ZZamboni