Spray the entire outside of the shade with a light coat of metallic gold, brass, or bronze paint.

When the paint is dry sponge on random layers of antique gold, rust and brown acrylic paint until you simulate the look of an old mica lampshade. Other colors can also be added if desired. When the acrylic paint is dry spray the entire outside of the lampshade with matte finishing spray. Add binding and decorative trim or punch holes and lace as desired.

Fiberglass may also be lightly spray painted or air brushed to reproduce lampshades popular in the 1950's.