Cirrus Design developed special colour paints (took quite a lot of effort and time) to break out of the "Got To Be White" tradition.
Look at
Photos: Cirrus SR-22 Aircraft Pictures | !!!!!!!!!!!!!!
Perhaps the RAF will in future be saying to any training aircraft supplier that "Got To Be White" doesn't hold true anymore and we're not buying any more of them...?
Maybe the glider manufacturers could approach Cirrus to see about how to get some of this paint, assuming suitable, onto gliders too.
The colour paint is relatively new technology. Personally from an 'avoiding mid-airs' I would like to see it used as widely and often as possible, considering how much 'got to be white' we are collectively capable of putting in the sky on a nice day.