Jamieson, Fausset and Brown on Esther 1:6

6. Where were white, green, and blue hangings, &c.--The fashion, in the houses of the great, on festive occasions, was to decorate the chambers from the middle of the wall downward with damask or velvet hangings of variegated colors suspended on hooks, or taken down at pleasure.

the beds were of gold and silver--that is, the couches on which, according to Oriental fashion, the guests reclined, and which were either formed entirely of gold and silver or inlaid with ornaments of those costly metals, stood on an elevated floor of parti-colored marble.