To breed for a certain colour you must have your starter horse and then breed into it with any of the 3 varieties (black,white or maroon), when you breed the 3 coloured bars at the bottom change.
Main Steed + Minor Steed = New steed
------------------------------------------
Mortor Steed - White + Black + Black
Shadow Steed - Black + White + White
Tawny Steed - Maroon + White
Khaki Steed - Maroon + 3x White
Moon Steed - Maroon + 5x White
Sandy Steed - Maroon + Black + Black + Black
Coral Steed - Black + Maroon + White + 5x Maroon
Pink Steed - Black + Maroon + Maroon + Maroon
Red Steed - Black + White +2x Maroon + White
Agate Steed - Black + White +3x Maroon
Ivory Steed - Black + 4x White
Java Steed - Black + Maroon + White + Maroon +3x White + Maroon
Pine Steed - White + 4xBlack
Cobalt Steed - White + 3x Maroon
Saphire Steed - White + 4x Black + Maroon
Emerald Steed - White + 3x Maroon + White
Yellow Steed - Black + Maroon + White + Maroon +5xMaroon + White
Golden Steed - Black + Maroon + White + 5x Maroon + 3x White
Lilac Steed - Black + 4x White + Black
Paisley Steed - Black + Maroon + 4xWhite + Maroon + White
Diamond Steed - White + 2x Black + 1x Maroon
Brown Steed - m+b+w+11m+2b+13(m+b+w+11m)
Indigo Steed - Black + 8x (Black + Maroon) + Maroon + (Black + Maroon)
Jade Steed - White + Maroon + 15x White + Maroon
Mauve Steed - 8(b+3w)+w+6(b+3w)
Misty Steed - w+5[m+(w+m)]+7m+w+m+w
NIGHTMARE - b+m+9w+6m+7(w+m+9w+10m+w)
PEARL STEED - m+7w+17(w+4m)
PLAID STEED - W+b+m+b+6m
Rime Steed - Black + Maroon + 4x White + Maroon + 2x White
Sandy Steed - Maroon + 3x Black