Just because simple solar lights would be too easy

Add some interest to your garden on a winter’s night with glowing orbs. If desired, these may also be created for use during warmer temperatures, but won’t last as long. The glowing balls are very easy to craft and display.

Acquire a large balloon, fill it with water, and tie it closed.  Place a tennis ball under the water balloon and either place the filled balloon outside during freezing temperatures, or use your freezer to turn the water into ice. Once the water inside the balloon has frozen, cut-away the balloon and remove the tennis ball. If desired, you can rinse your new ice ball with water to give it a more clear effect. Put a battery-operated tea light in the hollow spot or use a child's glow stick or glow bracelet.

Source: Upcycled Garden Style