I don't know if all the gymnastics floors are blue now. All the ones I've competed on have been blue though. Here are some interesting ones: Li Chunyang floor 1986 Goodwill Games AA [youtube]5dEV_yFciZg [/youtube]bright yellow! Svetlana Khorkina - 1994 Goodwill Games EF - Floor Exercise [youtube]rH-VBHvxNuE[/youtube] bright pink! pretty! they even say: the floor mat is pink, don't adjust your television set! lol

this one looks like a hotel lobby floor: 88 Moscow News WAG AA Ivkova (URS) FX [youtube]FrGCsr5Na2U[/youtube]

There are red floor mats common too I think, maybe more common in Europe, in USA it's blue or some shade of blue.