I personally don't think there is much of a market for 2 color LEDs, but that is just because I personally don't like their looks. I would think that 1 color fans would be more popular.
Anyway, I haven't seen any 2 color fans, but you could always try just getting some generic fans and going for a color combo fan GRILL that is UV sensitive.
They sell them at www.xoxide.com
and those I do remember having a lot of color combos, so maybe you want to try just having LED grills instead of having the LEDs in the fans themselves?