I made this for lovelyJen. It's a POV -- 8 bright SMD LEDs and an AVR uC. You wave it about, and it writes messages in the air, with no wires, liquids or unpleasant bending! Some would say that it's quite similar to magic. It's a double-sided kitchen PCB (toner transfer) with a flower on the back. It has a single button; held for a second, it switches it on/off. When on, a quick click switches between a set of predefined messages. It runs off a CR2032 until the end of time.
front
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back
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message
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pattern
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20th Jan 2011, © Matt Evans 
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