take a blue paint
take a sponge and deep blue paint on. so it looks like it here
I didn't have a dark purple so I used the pink and blue. I mixes blue and pink together so I'm doing a dark purple
deep dark purple on like the blue.
take a white
Now you need to deep white circles to resemble galaxer.
take a needle and low dots around to look like stars. by any of them you need to make large dots so you can make a cross.
Once you have created the stars deeper concavity gives you them so it give a Galaxy effect