First idea was to make copper sulphate crystals (http://www.instructables.com/id/Grow-Crystals/) So i was started making crystals but i failed. :( After two days i only had some small crystals and 2oz of that strange blue liquid you see in picture left...
There was only 2 hours before midnight left, and I decided tomorrow i must gift something to my girlfriend! Then I started thinking and idea shot straight to my head. I grabbed my instructables MagLite and just lighted to bottle with that solution...
This time my failure became succes!
Step 1: Get stuff
1 - Bottle with cap
3 - Blue leds
1 - 9v Battery
1 - 9v Battery clap
1 - ON/OFF Switch
Enought liquid to fill bottle
Hot glue gun
Dremel or drill
Step 2: Making the mysterious liquid
There is a lot of different colours salts. Ammonium cobalt sulfate is shiny red, potassium dichromate deep red, ammonium dihydrogen phosphate is green. You can find best colours by experimenting.
Well you can paint your liquid, but playing with chemicals is more dangerous and fun.
BY CAREFUL COPPER SULFATE IS HARMFUL!
I added some small shiny tinsel in a solution. They make my liquid more freezing.
Step 3: Make the cap
1. Prepare your bottle cap.
2. Drill hole and place 3 leds in it.
3. Glue leds with hot glue.
4. Solder your leds and switch.
5. Connect leds with a battery.
There is schematics.
You can add some crystals like i did. ;)