Textures: The sky is rendered as skybox. By default all six sides is painted with jorge texture. You can set textures with load_sky command. For example if you type load_sky nsky, DromEd will load textures named: nskyB.pcx, nskyT.pcx, nskyE.pcx, nskyW.pcx, nskyS.pcx, nskyN.pcx.
Stars: The sky is pitch black with white stars. There are some commands for this type of sky:
set_star_count - sets amount of stars. Default is 150.
set_star_rate - sets the rate at which stars rotate.
set_star_axis - sets axis at which stars rotate. 0 = x, 1 = y, 2 = z.