More to explore:
DIY Magic bottles—fill with distilled water, glycerin drops, glitter flakes, sequins, light plastic beads - anything that sparkles and is light enough to float around. Could be used with floating candles in centerpieces
Use cheesecloth to make a floating ghost
glass bottle bottoms
Ice cube painting
wine bottles with the tops and bottoms cut off...
DIY Upcycled Soda Bottle Ice Flower- would look cool floating in the punch bowl.
Ok you could do this with any shape!
Soda bottle-bottom apples! (teacher gift?)
Luau - Pineapple Sangria
Floating Glass Vases
Freeze colored water in the bottom of a cut off two-liter to make flower shaped ice cubes for party punches!!