This tutorial is aimed at Photoshop users.
First you need to open up a new canvas seized 36x36 or make it smaller or bigger whichever you prefer. Make it all black and then
define your brush.
Now
select your brush and make a
new layer on top of where you want to add the glitter.
I have a German version of Photoshop but everything should be in the same spot.




Then you can add styles, shadows etc.
You can achieve this result with any brush.