Appaloosas can be a heartbreak to breed for show... You put a whole year of waiting, and really hope for color... but sometimes you get really nice horses that would be show quality but for the lack of one spot. Paints are the same way, color breeds are just such a gambler's wager.
At paint shows, I ~believe~ all the solids are separated into their own classes, but they can be just as competitive. The offspring of Paints, once outcropped from regular QH and TB stock, can't be returned to AQHA registry even when they are solid and indestinguishable from any other plain brown QH.
Since we show in open shows, we can show all our kids, solid or not.