There was a review of the A10WRB here, [Review] RAYUS A10 WRB (MultiLED & Multicolor XP-L/XP-E/XT-E / 1x 18650, 2x (R)CR123a) It mentions some uses for the colors, but for me it is more just for fun. 
I have a A10RGB on the way from techtoolsupply.com , hopefully to arrive today or tomorrow.