This tutorial would be good to use as a texture or an extra flair to an image you are making. Let me know if this tutorial helped you or if you have questions/comments.
1. Open a new document in Photoshop. I made mine 900x542. The background needs to be black for this tutorial.
2. Take your brush and go to the default brushes on top, the soft circle brush. Make your brush sized 100px. Dot several different colors all over your background.
3. Now that you have all your colors on your background, go to FILTER>STYLIZE>TILES. A box will pop-up. Make your settings match the ones below:
Your new background should now look something like this:
4. Now go to FILTER>STYLIZE>GLOWING EDGES, make your settings match mine:
This is what your final product should look like: