Edit: I didn't realize you couldn't use image material in mobile. I apologize and have now fixed it. :)
These are various materials I made to use for my art & my own brushes. Feel free to use them for whatever you want. Some were scanned in from paper I own, some photographed from clothes, and some drawn digitally.
Some Examples:
Cardboard:
Inkdots + Stenograph Paper
Knit:
Cold3 (Cold Pressed Watercolor Paper)
Cloth
I tend to set the layer mode to multiply or overlay when I use them & change the color to something more appropriate for the picture. Brushes are adjusted to whatever feels nice :p
A few of these are already used on my released brushes:
Left to right: Cloudy B, Spotty, Static but Saturn, Cheese Cloth.
Cold3, Spotty, & Stenograph paper are my favorites for paper textures.
Cloth is my favorite canvas like texture, and I like cloud b and dapple for watercolor-like effects.
Some of these have weird names, so feel free to change them. Hope you enjoy :)