Here's a relationship chart of the colors of all 128 FBS college football programs, put together by 614 analytics. It serves as a good reminder that some schools have some truly ghastly color combinations. Brown and orange, Bowling Green?
Red is the runaway winner for overall usage, and red-and-white is the top pairing. Gold, meanwhile, is hugely popular, though a lot of schools wear a yellow in its place on the field. The actual color yellow's representation is shockingly small, but that could be due to how 614 drew the lines between it and gold. You can see the full color data set here.