monochrome

dappled (also dapple), marbled, shaded

mottled, parti-color (or parti-colored), piebald, pied, pinto, skewbald

banded, barred, brindled (or brindle), streaked, striated

checkered, dotted, patterned, plaid, striped

flecked, specked, speckled, spotted

bicolored (or bicolor), dichromatic, two-tone