Looking at the symbols of the Greek Letters of the alphabet, we have another group that would take the roulettes for souvenirs. The sorority and fraternity of colleges would easily take all of there name on a visit.

Many of the 300 of each color on a table are already in short supply.

I believe the names of the letters are:
Top row:
Yellow- SIGMA ***** Maroon- GAMMA ***** Light Blue- PI

Pink- LAMBDA