Copper foil tape is perfect for wrapping glass pieces together before soldering with soft solder.
Tinned Copper wire is commonly used by stained glass workers, because soft solder flows nicely onto it. Use thinner gauges to (30ga to 24ga) to add tinned-copper embellishments like spirals, swirls and cat whiskers. Use thicker gauges to create wire loops for hanging, at the tops of suncatchers, stained glass pieces, and soldered-glass pendants. 24- and 22-gauge are fine for earrings and smaller pendants; use 20- and 18-gauge for heavier jewelry and suncatchers. Tinned copper is a good color match for soft solder and white-plated jewelry findings.