tumbleweed

Any plant which habitually breaks away from its roots in the autumn, and is driven by the wind, as a light, rolling mass, over the fields and prairies; as Russian thistle, witch grass, wild indigo, Amaranthus albus, etc.

(attributive) Describing unwanted silence and inactivity. Often used of a situation when one makes a statement that is ignored or ill-received by one's audience, as the resultant silence is likened to that of a desolate desert with rolling tumbleweeds.

A tan colour, like that of a tumbleweed.