I found this tutorial on creating a Sticker: https://www.artrage.com/sticker-spra...ustom-sticker/
I got it work, but i guess it's not exactly what i want.

I was hoping to take my own image, a PNG, then use it like Fur and Hair, so that i could select a color and use the Sticker Spray tool with it.
Right now, all i have is a sticker and it just paints in that color, can't change it.

Anyway i can do what i'm trying to do?