Original suggestion is "nail polish + recycled lightbulbs for garden art." I think they'd make cute Christmas ornaments, and there has to be better paint and glazes than nail polish, with its tiny brushes.
Would be interesting to see about recycling some old bottles this way. I think this would be cool if you removed the metal base from lightbulbs and put small LED/Christmas lights in them for patio or accent lighting Mehr
Sunflower: Glass Hanging Garden Mosaic. Art for your garden from Primrose Mosaics. Gift idea.