A neat idea to get this look without might be to use wide masking tape and make hole punches with a lattice paper punch like this one from Michaels or this one. Press the tape onto the glass until no gaps are showing. Then spray with silver high-heat spray paint. The light will shine the pattern onto the walls. Use a very low wattage bulb like 40 or less AND be absolutely sure to paint with high heat spray paint. Like this one at The Home Depot. Image Source.