I just love hardware stores. What I have here a a square picture frame painted black that I use to mount different screens, scrims and odd materials that I find in the store. I have pictured different “bug” screens and a plastic square mesh that I found in the garden isle. They all have a unique look when I employ my speed lights through them. The frame snaps apart for easy travel in my 42″ Lightware Cargo Case and all the scrim pieces lay flat on the bottom of the case.
Get crazy try all kinds of different stuff. You just might find something that adds a unique quality to your images.