1) Make a new document, anysize doesn't
matter. Press CNTRL+D to reset your pallete colors. Set your background
to White or any color that suits you best.
2) Open up your graphic you wish to turn into a ball. It is best to use a filter effect, for example I used the typhoon effect for this ball.
3) Select the Eliptical Marque Tool and hold shift to make a perfect round selection like below:
4) Right click the layer and set these blending options:


5) There ya go, cant get any more simpler then this:

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