I like the idea of colored glass since full paint is so expensive...but I've experienced southern heat through colored glass and would be inclined to still opt for the white though a very light tan wouldn't be bad as long as the white glass roof was kept.
If you want to give more choice...one thing I'd suggest is design a few DIFFERENT stickies for each coach. Right now...you have one choice in different color stickies.
I'll bet a graphic artist could come up with 3 interesting graphics in pretty short order. (I'm in line for the big paisley ones)