Based off of the designs used in The Legend of Zelda: Ocarina of Time and Majora's Mask, I bring you the fairy in a bottle. This cute little guy features 2 Pink LEDs with a toggle switch to turn it on and off.
Approximate completion time: 3 Hours.
Approximate cost: ~$10
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Step 1: Materials
1x Bottle, preferably a former milk bottle, with cork lid (I found mine at Goodwill for $1.50. Secondhand stores work best).
1x Ping Pong Ball; it is important that this be white and have no brand markings/labels. As such, the dollar store is your best bet.
1x Clear Plastic Folder and/or similar thin but dextrous plastic.
1x Button Cell battery. I used a 1616 with tabs for easy soldering. A 2032 will likely last longer, if you wanted to.
1x Resistor, 12ohm. (optional; it probably isn't necessary, but it didn't hurt to put in the circuit)
1x Ultra mini toggle switch.
2x Pink LEDs, preferably diffused***
Thin cardboard, such as that of a soda box
Thin wire, higher than 22 gauge.
You will also need the following tools:
Drilling implement (Hand drill, Power Drill or Drill Press) with the following bits: 5/16th" and 3/16th".
Scalpel and/or Scissors
Soldering Iron + Solder
Center Finder (optional)
Ink writing implement.
PLEASE USE EXTREME CAUTION WITH THESE TOOLS, AS WELL AS COMMON SENSE. STAY SAFE, WORK SAFE.
***for a complete guide to diffusing your LEDs, go to http://www.instructables.com/id/how-to-defuse-an-LED/