Was at a family friends place recently, and noticed he has a starfield (looks like the night sky) on the ceiling of his nursery room. Given how much a fibre optic setup can cost, I asked him how it was done. So here goes. Artex stipple effect applied to the formerly smooth ceiling. Then a matte black coating put on with a soft roller brush so that it goes all over to create a non reflective surface. Then a coating of gloss white applied by hand with a small brush to a few spots - the beaty part is that you don't have to do it well, just dab away. I suppose if you were feeling particularly flushed with cash you could use glow-in-the-dark paint instead of gloss white. Anyway, it looks pretty good, given how cheap and easy it is.