I don't know where to go and learn, but try this:
1. Cut out a circle out of a piece of paper. 2. Draw a cross, so to divide it in 4 sections. 3. Color these with 4 different colors, like, for instance, green, red, blue and yellow. 4. Put your ball in center and see then if it works.
If no cloud or smoke manifests try different colors, tones of the same colors, and make sure the colors are put in the right sections to produce the 'flashy' effect.
-thief
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-Believe in me and you shall fail, for not even I believe in what I preach. -But I succeded! -Then you are doubly a fool.
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