Hi there! Quick info:
These brushes may be used in personal and commercial work; credit is not necessary. I appreciate feedback, and if you feel like sharing what you've done with them, feel free to link to your work in the comments!
I always set the spacing to the brushes to maximum so that you can get a constant stream of texture - reduce the spacing for a more lush feel to them but less texture in the middle. This set has 2 variants, one darker and one lighter and more transparent (the light set is the one in the preview).
Customized in Photoshop CS6, have fun playing with them!