The colors in the Olympic rings..
The maker of Olympic ring was Pierre de Frédy, Baron de Coubertin, created in 1912. It is a formation of five interlacing rings of blue, yellow, black, green, and red.
At least one of these colors is found in the flag of every nation. However, the co-founder of modern Olympic games i.e., Pierre de Frédy, Baron de Coubertin never supported the fact formally (at least I haven’t seen anything as such till date). May be it’s just a coincidence!