Here's an idea for a fairly easy quilt. HOw about log cabins using the stary skys as one the light sides and the planets as the dark sides. Red chimneys would be too much of a jolt I'm afraid, but maybe one of the reddish purples might do for center squares. Try for 14" (finished) blocks----------3 across and 4 up and down. Many ways to set them together. 42 x 56, good size.
Don't want much smaller blocks, you'll lose all the definition in your fabrics.
Use your chimney fabric for backing and binding-----------no borders to speak of.