So far the best thing I had come up with that would realistically work is coming up with a set of “properties” like hardness, mass, conductivity, etc and making the individual bits (matter and energy) have random properties that you could mix and match to get stats for things you’re making… But that still sounds too simplistic and boring to me. But I tend to be a perfectionist so maybe it would be something others would be fine with and I’m just sabotaging myself.