Riverbed grey, worn smooth by water that's taken the long way round.
Meander is a warm grey.
It can be described as warm, muted, greyish and dusty.
Set in black, because black reads best on it.
A meander is one of a series of regular sinuous curves in the channel of a stream. It is produced as a watercourse erodes the sediments of an outer, concave bank and deposits sediments on an inner, convex bank which is typically a point bar. The result of this coupled erosion and sedimentation is the formation of a sinuous course as the channel migrates back and forth across the axis of a floodplain.
Read on WikipediaA meander or meandros is a decorative border constructed from a continuous line, shaped into a repeated motif. To some Italians, these patterns are known as "Greek lines". Such a design may also be called the Greek fret or Greek key design, although these terms are modern designations; this decorative motif appears much earlier and among Near and Far Eastern cultures that are far from Greece. Usually the term is used for motifs with straight lines and right angles and the many versions with rounded shapes are called running scrolls or, following the etymological origin of the term, may be identified as water wave motifs.
Read on WikipediaProper noun