I dug out some holographic brushes which I used to use regularly in my artwork. There's a mix of Bokeh, shattered glass shards and fun / holiday themed shapes in there. (I stopped using them as I forgot to install them on my new PC until yesterday XD)
These are in ABR format- primarily for photoshop but can be imported into any program that accepts ABR, like Clip and possibly Procreate
I put em up on Kofi (for free) in case anyone wants some new Holo tools to fiddle with :)