I have been wondering how to do this for a long time. One of my weakest points in using photoshop is how to use brushes, now I dont mean the normal brushes that come installed. I mean the ones download of shapes and objects. I have found many free brushes and they be really cool to use to make images and what not but I install them and im like now wtf do i do.

Here is a good example I downloaded these brushes
http://www.brusheezy.com/brush/399-Abstract-Brushset-X

The Images posted here was made with these brushes.

Now my question how do I use them to get the same effect for example add different colors to parts of the brush. I mean what good is having all these great brushes of shapes and complex objects if you just make them one color. Doesn't seem like fun to me lol. So if any one can post some tips even tutorials I searched and searched the net and only tutorials I find on brushes is normally how to make brushes or make a image into a brush. Not the most effecent way of using them anyways. Thanks for any help you all can give me.