Real Dictionary

harlequin
You use harlequin to describe something that has a lot of different colours, often in a diamond pattern.

Harlequin in American English
a traditional comic character in pantomime, who wears a mask and spangled, diamond-patterned tights of many colors and sometimes carries a wooden wand or sword
comic; ludicrous
adjective: fancifully varied in color, decoration, etc
noun: a comic character in commedia dell'arte and the harlequinade, usually masked, dressed in multicolored, diamond-patterned tights, and carrying a wooden sword or magic wand

harlequin in British English
adjective: varied in colour or decoration
noun: a stock comic character originating in the commedia dell'arte; the foppish lover of Columbine in the English harlequinade. He is usually represented in diamond-patterned multicoloured tights, wearing a black mask