White

also: pale; blanched; sallow; pallid; waxen; spectral; translucent; albino; 

Grey

also: dust; stone; pepper;  

Black

also:  coal; slate; dusky; ebon; shadow; murky; 

Tan

also: flesh; khaki; cream; tawny; 

Brown

also:  henna; russet; sepia; chestnut; cocoa; drab; bronze; 

Red

also: terracotta ; rouge; carmine;  fire-engine; ruddy

Orange

also:  pumpkin ; rust ; 

Yellow

also: sunny; amber; saffron; hay; straw; platinum; 

Green

also: viridescent; grass; jade; forest; 

Blue

also: turquoise; cyan; ultramarine; royal; aqua; aquamarine;

Purple

also: berry;  amaranthine;

Pink

also: flushed; candy; cherry blossom; petal pink ; 

—– source: http://ingridsundberg.com/

—–additional synonyms added by me