This was just a lark that had been itching in the back of my head for a while. It's a mains powered LED lightbulb.
Step 1: Supplies
There's not too many things you need for this project.
An incandescent light bulb.
A .47 microfarad 200V capacitor.
1/4 watt 1kilo ohm resistor
a pair of leds
and miscellaneous things.