".Blueskies." wrote

No mention of any colors required he
http://www.airventure.org/atc/arrival_signs.html

Looks like big block letters on a white background...
Looks like Jim's are all dated from last year. Did something change?

Looks like you noticed something.

Jim (I'm guessing) got his from EAA last year, and they were trying the
colors. I did not notice many people using the colors last year, so they
probably just gave up on colors for this year, since nobody used them,
anyway.
--
Jim in NC