The Nitty Gritty brush set is great for adding some fine grit texture to your designs inside of the Procreate app.

Nitty 01
Nitty 02
Gritty 01
Gritty 02

These brushes can easily be scaled and adjusted for more/less texture. Be sure to check out my short video tutorial to see how I use these brushes in my own work.

Note: these brushes are for use inside the Procreate app only.

Installing Procreate Brushes: http://ipadcalligraphy.com/procreate/install-brushes-in-procreate/