Well, Faux holographic, but they look holographic!
Three different "holographic" pens that work by having an unchanging main color & a changing sub color. Feel free to adjust the colors & particle size to your needs. You can either use these to decorate, add effects, or make your own holographic color texture from it.
All brushes change color. Feel free to just use the colors I did if you'd like. :D
Category 1