Considering the prices of garden lights these days, I've been looking for a low-cost alternative. Lucky me, I found a DIY for temporary garden lights you can make from only LEDs, lithium coin cells, mason jars, and a little bit of tape. The lights will be temporary, until the battery runs out, but you can always refresh your battery supply just for about 30 cents each.
Supplies:

• One ultrabright LED with a diffused lens per light
• One CR2032 lithium coin cell per light
• One mason jar per light
• Tape, masking is fine

To learn the steps, read more.

1. Connect an LED directly across the terminals of the lithium coin cell, so the long lead goes to the positive (+) side of the battery.
2. Wrap it once with tape so the LED stays touching the battery cell.
3. Half-twist the LED 90 degrees from the battery cell so that it can bend that way and the two leads of the LED don't touch each other.
4. Tape the light to the inside of your mason jar lid.
5. Screw the lid on. Fini!