Its hard to really answer this question, its more of an opinion based one, therefore it all comes down to personal preference
Appaloosa is a pattern not a colour. The base colour of the appaloosa can be any of colours that you see in non appaloosa horses
I feel like a dark-ish color can work. Maybe purple, black or gold, up to you!
Yes,it will look good because they looks good
I think that black would always look good but if you are more outgoing I think that something with a similar blue color would look good.
Roughly like an appaloosa horse with marble markings
Red would look nice.
brown
a color that would look good on red carpets is brown or peach
a white spot under their lip, in their ear and/or under their tail. some horses are spotted some are not. their disposition is offten very stubborn! look me up: ThoroughbredLover, and i own an appaloosa mare who is regestered but is a chestnut color with not obvious spots!
Purple or electric blue.
gold or silver
green is always good with red hair
1. Horses don't get fleas, they get lice, and 2. it's a horse with lice, what else are you going to call it? 1st. Fleabitten is a color for a horse. Its a white/grey with tiny specks (look it up under google images you will see different examples) 2nd. So you dont really call a flea bitten horse anything its a color. You maybe getting the fleabitten color mixed up with the appaloosa breed. The appaloosa breed is a horse with larger spots. In which you call the Appaloosa :D