First of all, I decided to print an inverted cross. You can do this, another shape or do the whole thing it's up to you. If you do a shape use masking tape to mark it out like this.
Then cover the rest with newspaper. Put newspaper inside too or it'll go through.
Cover the surface with newspaper and wear old clothes, wear gloves. Put bleach in spray bottle. I first tried it watered down but it did nothing so I used it neat. Spray as desired!
Once dry, remove the tape. I had some bleeding but that's ok I'll fix that in a bit. Next wash and dry the top to stop the bleach reacting any more.
Next I used black fabric paint to touch up the bits that had bleach on that I didn't want to. Then mask it off again like before!
Using acrylics, sponge on paint. I went for mostly pink and orange colours but purple and blue work good too. I added white first then yellow, pink, purple. Then added more white.
When you're happy, using a paintbrush paint white dots for stars!
This is how it turned out, I'm pretty happy!
I added glitter as well but you don't have to. Next take all the tape and newspaper off.
Then you need to set the print with heat. Best way is to iron, you can also use the tumble dryer...
Place a cloth over the print and put the iron on its hottest setting. Iron pressing down firmly for a few minutes without steam. I then like to wash it again but that's up to you. Finished!