Awesome Infinity Wallpaper!
Here's a cool wallpaper that gives a good impression of how to combine some awesome brushes for example the ones from ShiftyJ (check him out, he's got some cool files to share with you)!
P.S. This .psd probably works just fine with lower versions of Photoshop cause I enabled "Maximize Compatibility". I'm still not quite sure, so just try it. :)