I started with 1 pair and they gave me 2 cocos, 2 blues and 1 grape, rest all genesis furs, i managed to keep 1 coco and blue to keep my line going. I admit i made the mistake of quickly selling any colors i got initially.
As many points were already discussed here, i'll keep this short and say in the end, its all gambling. Like Shukie said, hit and miss. Sadly, the odds of hitting are very low and unless you have so many pairs as Tad pointed out, you must not expect much (unless you are sooo luckyyy! And the kitties decide to drop colors in two rounds laughs)
My advice is if you cant handle feeding two cats who will perhaps in the end give you nothing, best not to go into confettis. It is kinda like playing experiment with the collections kitties, except here we really have no idea of knowing.
Happy breeding!