Bouncing balls (aka gravity). Pastebin is  http://pastebin.com/ABkq6ivP . Now, onto the next.

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Bouncing balls (aka gravity). Pastebin is http://pastebin.com/ABkq6ivP.

Now, onto the next.
http://www.youtube.com/watch?v=GuI7mx4Q3DA

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Newton’s Cradle!

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Does not work for me: Uno + WS2812B
Error: FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );

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Mathieu, how about:

LEDS.addLeds<WS2811, LED_DT, GRB>(leds, NUM_LEDS);

where LED_DT is defined your data pin and NUM_LEDS defined for the number of LED’s you’re using. Also, you don’t mention whether you’re receiving compile errors or if nothing displays. Also, have you tried simpler displays so that you know everything is wired up properly.