You can submit as many coats/patterns as you wish...., but will have to pay to have them added to the game with a BLACK PEARL for each coat.
The coats are randomly selected from all possible coats for that breed.
They already have if you mean the horse coats, backgrounds and pet coats!
There is a topic in the 'Events' forum showing the coats.
When you buy a golden apple from the black market, or win one through other activities, you can choose from player created coats.
You can make various coats for horse, including the Golden apple coats and diamond apple coats.
Ask in the 'Retired GA Coats' topic or the 'Howrse Spotters' topic in the events forum on Howrse.
Howrse recently changed and updated the coats of each breed to Version 3.
go to the black market and go to the golden apple and then choose your howrse and then a list of coats and their picture will apear choose one go to the bottem of the page and click the button!
New coats are added every day.
That's mostly the point of Howrse.
no all coats are randomly selected by howrse.com
Howrse recently released a Version 3 of all the horse coats and got rid of all the previous version 1 and version 2.