The fastest way is to find the probability that none is a color set and subtract that from 1.
P(none is color) = 2/8 * 1/7 = 2/56
P(at least one is color) = 1 - 2/56 = 54/56 = 27/28
Agree with ywilfred's working
Don't be afraid to take a flying leap of faith.. If you risk nothing, than you gain nothing...