Thanks to everyone who answered peoples questions for me!

Glad you guys like the brushes. In practical use, I wasn't as happy with the brushes personally but I find them very useful for adding additional texture towards the end of a painting.

I will sometimes add a new layer that is just for texture. I set the layer to one of the transparent blend modes (multiply, darken, overlay, lighten, etc) and I paint over areas that I want more texture. soemtimes I play with other colors as well to add visual interest. You can play with the transparency of the layer to get either more or less of an effect. Here's an example where I used this effect with the native oil paints:

Click image for larger version. 

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You could use a similar method with my texture brushes to add what looks like a thicker paint texture (to add both the highlights and the shadows in the texture of the brush, use overlay blend mode, and to only add shadows, use multiply/darken, and to only add highlights, use lighten modes). I believe I used color burn for this one because I wanted a more vibrant effect. (this painting was done in artrage 5 I believe).