While that's impossible(without it being toxic), this is easily the next best thing!
Step 1: Parts Acquisition
The tricky part was digging through resistors, as each LED requires a different voltage.
I found the LEDs on Amazon and I acquired the resistors and screw terminals at my local RadioShack(yes, they're still in business).
I already had a pack of (cheap)PCBs, and the necessary tools.
Step 2: Soldering the Connections
Step 3: Give It a Test
Blowing smoke above the lights gives an almost hypnotic, color changing effect as it billows around.
Step 4: Qualified Success
- I didn't post specific resistor values because it honestly depends on you input voltage.
I used 6v in, but had to drop it down to about 3 anyway, so you could actually power this off of two double or even triple A batteries.
- Your LEDs might have different power requirements, this is just a general proof of concept.