Big Clive has taken a dollar store fiber optic display and converted it to run off of LEDs. He has built an interesting circuit that allows the low voltage LEDs to operate from 220VAC (yes Clive is not from North America). He demonstrates his circuit board fabrication process and provides a schematic drawing so you can build your own.
Hacked Fiber Optic Display
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Yah, Im going to actually do this one.