These are the sources for the patterns and things I use/I'll use/I've downloaded on GIMP in case I decide to use them. I have to give credit where credit is due, of course. Even in the case that I don't use them, you should still check them out. They all work for Photoshop as well, Methinks.
free-brushes.com
InvisibleSnow (https://www.deviantart.com/invisiblesnow)
obsidiandawn.com
KeReN-R (https://www.deviantart.com/keren-r)
blendfu.com