Great tutorial on how to make custom brushes in GIMP:

Every blogger out there knows how much time is spent on graphics. Designing graphics or deciding graphics is a damn difficult and time consuming job. There are some amazing apps like Canva, PicMonkey one can use but what I use is called GIMP. GIMP is the free alternative to Photoshop, albeit with limited features. Take, for example brushes, there’s not as huge a collection as I would like. So the only thing I can do is make some brushes for myself.

Right below are the steps you need to follow in case you want to make your own collection…

Source: How To Make Custom Brushes In GIMP – Whimsy Journals