Here is a list of all the different Holland Lop colors currently recognized by the American Rabbit Breeders Association, as of early 2019:

AGOUTI:
Chestnut Agouti
Chinchilla
Chocolate Agouti
Chocolate Chinchilla
Lynx
Opal
Squirrel

BROKEN:
Broken
Black/Orange Tricolor
Chocolate/Orange Tricolor
Blue/Fawn Tricolor
Lilac/Fawn Tricolor

POINTED WHITE:
Black Pointed White
Blue Pointed White
Chocolate Pointed White
Lilac Pointed White

SELF:
Black
Blue
Chocolate
Lilac
Blue-Eyed White
Ruby-Eyed White

SHADED:
Sable Point
Seal
Siamese Sable
Smoke Pearl
Black Tortoise
Blue Tortoise
Chocolate Tortoise
Lilac Tortoise

TAN PATTERN:
Black Otter
Blue Otter
Chocolate Otter
Lilac Otter

TICKED:
Black Gold Tipped Steel
Black Silver Tipped Steel
Blue Gold Tipped Steel
Blue Silver Tipped Steel
Chocolate Gold Tipped Steel
Chocolate Silver Tipped Steel
Lilac Gold Tipped Steel
Lilac Silver Tipped Steel

WIDE BAND:
Cream
Frosty
Orange
Red