The surface of a star close enough to see it boil: convection cells with cool sinking lanes, sunspots with striated penumbrae, limb darkening, spicules and magnetic loops off the edge. Colour comes from temperature, so a spot reddens as it cools.
Drawn with: a WebGL2 shader.
Reacts to and looks like: gpu, webgl2 and sun.
Family: Visualiser.
Runs in your browser. The preview above is the same program the renderer uses.