ADJECTIVE 1. Of or like a serpent or snake. "serpentine coils"
NOUN 1. A dark green mineral consisting of hydrated magnesium silicate, sometimes mottled or spotted like a snake's skin. 2. A thing in the shape of a winding curve or line, in particular.
VERB 1. move or lie in a winding path or line. "fresh tire tracks serpentined back toward the hopper""
(Tip of the hat to dpchallenge.com.)
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Shape, colour, form, movement.. and and.. what more could a contest topic ask for?
I've added the topic Three of a Kind. This refers to design elements in the shot, fractal, illustration or whatever. Fits all artists and I don't think we've done it before.