I generally do this with preppy signs but for the sake of the tutorial I’m just going to open a new blank canvas at 160x200px. Define the sparkle brush I provided for you and make your color scheme into a gradient. Then grab the sparkle brush and stamp it onto the canvas. Normally I do this in the color white, but since it may be hard to see with the transparent background, I’m going to do it black.
Duplicate this layer by pressing CTRL+J. Now, on the bottom layer (the original), go to your blending options and set a gradient overlay matching your color scheme onto it. Then, hit the move tool and use your arrow keys to nudge the gradiented sparkles 2 to the right and 2 downwards.
Make a new layer and merge it together with your gradiented layer. Then go to Filter > Noise > Add Noise. I keep my Amount at 15%, the Distribution is Gaussian, and I check the Monochromatic box. Hit OK.
and you’re done
And that’s pretty much it. This effect can be done with any type of brush, I like doing it with cluster brushes, and I generally use it on preppy signs. So here’s an example of what that looks like: