How did a horse of a different color originate?

1. Dark Bay 2. Light Bay 3. Seal Brown 4. Chestnut 5. Dapple Grey 6. Buckskin 7. Palomino 8. Dun 9. Blanket Appaloosa 10. Cremello 11. Black 12. Leopard Appaloosa 13. Blue Roan 14....

There are many different horse colors. They include... 1. Buckskin 2. Strawberry Roan 3. Bay 4. Blue Roan 5. Black 6. Dun 7. Red Dun 8. Chestnut 9. Grulla 10. Piebald 11. Skewbald 12. Cremello 13....

it depends on the chromosonses it gets from its parents.

You can only get them in bright like orange yellow brown gold and colours like that.

Yes, in fact one horse had a split colour eye with blue and brown in one eye.