Bowl of Bulbs: Let there be light! Tuck a candle into a bowl of Christmas bulbs. Look for the old-fashioned strand of bulbs. Then
How to Make a Tiny Terrarium - DIY: Repurpose your old light bulbs.
Mad Scientist Lamp: I think old tube light bulbs are beautiful and this DIY lamp showcases them quite nicely.
I applaud anyone who can think to glitter old Christmas light bulbs! Genius