I messed up a pair of shoes when I was trying to make the Reign of Terror shoes on the cover of Sleigh Bell's album and thought, "hey, why not just make these into something better?" After some thinking I decided on galaxy shoes with a tribal print side. This is how I did the galaxy.

Step 1: Materials

Paint;
Dark Blue
Black
White
and your choice of colors for the nebulas. I used yellow and red.

Brushes:
Sponge
tooth brush
small paint brush

Canvas shoes

Water (for cleaning brushes and blending paint)

Paper Towel (for cleaning mess and wiping brushes)

Step 2: Painting the Shoes

First, I used blue as a base coat

Then blended in red and yellow for my nebulas. Just sponged them right in there.

Added white swirls, then blended them in

Splattered on stars with a tooth brush and a paint brush. Without the tooth brush, just spattering it on looks sloppy (I tried it my first time).
Point the toothbrush towards the shoe then scrape the end of the paint brush against the bristles, pulling towards you. None will splat on you if done right.