Okay, this will teach even the newest person to to effectively brush detailed and colorful (or less colorfull) abstracts that you can use for Backgrounds, or whatever you want. And before we start i want everyone to know i use photoshop cs2, so if you use a lower version then several things might be different. But it should be similiar no matter what version your using.
Here are a couple good brush sets you can download.
Brush 1Brush 2*Hint* i used both of these when making this tutorial*
Oh ya, the brushes arent mine, but the images and text are so...
Copywrite Marineking.
Rip, Die.
First of all make a new canvas (File-/new...) and make it about 125 hight and 400 width pixels, and make sure to select transparent in the "background contents" drop bar. And then fill it wil black, you can do this by using a default brush and just brushing black over the entire image, or by going to edit-/ fill and selecting black in the drop bar.

then click the brush icon on the toolbar, and pick a brush, and then start using single clicks to make designs on the black background, and make sure the brush color is white.

Dont go to wild, make it small and simple.

Now press Ctrl+U and select "colorize" then adjust the hue and saturation untill you have you have a nice, simple color, as shown below.

Now click on the "layer" tab and select new-/ layer... And then select another brush and start making single clicks around the colored back ground. And then after three or four clicks select the layer blending drop bar on the layers menu and change the blending to either overlay, screen, linear light, or color dodge. Make several more layers and repeat this step with different colors, and different layer modes, try them all. afterwards you should have something like mine below.

(Colors may vary depending on what your using.)
now create another new layer and fill it with white. then make four or five brush strokes (Single clicks) using a white brush untill you have something like this.

(It may look different depending on what brushes your using.)
Then change the layer blending mode to overlay, and ta-da, you shoudl have a nice, vibrant, colorfull abstract that will make any parent proud.
This is what i came up with, but dont despair if it isn't the same. As long as YOU like what you made, and if you dont, try again. And remember to keep exparamenting with different layer blending modes, brushes, and colors.

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