"Cover a light bulb with a doily and spray paint it. The light will shine the pattern onto the walls." I don't know how I feel about flammable spray paint on a hot lightbulb. Maybe spray paint them silver and use them as non-light decoration?
I've noticed more and more that people get rid of doilies either by thrifting them, giving them away for free, or throwing them out. Here's a creative and unique looking idea for a light shade using doilies.