The Cambridge iGEM2009 team has produced a series of gene expression cassettes that allow in vivo production of a spectrum of pigments in bacteria. More details can be found at http://2009.igem.org/Team:Cambridge/Project/Pigments

Carotenoids: The enzymes required for carotenoid production originally come from Pantoea ananatis, and were available in the registry. These were used to produce orange and red.
Melanin: The tyrosinase required for melanin production originally comes from Rhizobium etli and produces brown.
Violacein: The enzymes required for voilacein production came from Chromobacterium violaceum. The operon can be manipulated to produce violet, green, and blue.