I combined ideas from The Ice Bulb and LED Frosties. And it was a blast! (will have to get photos and insert later) You might find other creative ideas at the Radio Shack Make it Glow Contest. A big shout out to Instructables.com, a great place to get ideas and learn ‘how to.’
1 20 pack assorted LED’s from Radio Shack $3.99
3 9 pack watch batteries from Radio Shack $1.79 each ($5.37)
1 pack of balloons I already had on hand, 8-10 inch round balloons worked best. Water balloons were too small.
Step 1: Lighting the LED’s
The LED has two probes, straddle the LED over the watch batteries, one probe on either side. If the LED does not light up, turn the probes around, they only work in one direction. (Long probe is + and short probe is –, match these up with the + and – sides of the battery or just have fun with trial and error.) Now scotch tape the probes to the watch battery. Repeat for all the LED’s.
Step 2: Waterproof the LED
We wrapped our LED’s in plastic wrap, you could use zip lock bags. I’m sure there are lots of other ways to encase them making them waterproof.
Step 3: Insert into the balloons
Carefully stretch open the neck of the balloon all the way to the belly of the balloon, insert one wrapped, lit LED into the belly of the balloon. It helps if the balloon has been stretched, so you may want to blow it up and then deflate it before inserting the LED package.
Step 4: Fill with water and tie off
Slip the edge of the balloon of the head of the faucet and fill with water. Less water makes smaller balls that freeze faster. More water means larger balls that take longer to freeze. Fill the balloons as much or as little as you choose, then tie off.
Step 5: Freeze
It’s been below zero here recently so we just placed these outside. Even with the balloon skins on, they still look pretty, little glowing orbs in the snow.
Step 6: Unskin them
Once froze, peel off the balloon skin and then display as desired.
Once the the batteries dies, simply melt and retrieve your LED and repeat, or find a new idea at the Radio Shack contest linked above.