and also it depends of u have PS7 or 6
WITH PS7: you just take a HARD edge round brush...and use the scatter element...and then duplicate/blur...but u can do this many ways...its best to use the BLUR tool...and randomly blur spots to create distance and motion...

WITH PS6: You have to create your own brush with a large uhh i forgot wht u call it...but its the distance between each stroke...and then do the blur thing...

Optional effects...if you have many layers a kool touch up thing is to take a layer and change the blending mode to have an "outer glow" and every other layer is a diff color...

Maybe some different color versions.

The second one looks great to and the minimal color usage could make it a great T-hirt Design.

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Wer nicht vom Meister lernt, lernt nie etwas.