I did make some ornaments similar to my IaM fellow, Ellen, which was super fun! I played around with different materials, using balsa wood, basswood, and acrylic. I did learn that Lexan is not ok to laser. It gives off toxic fumes. The other thing to pay attention to is adhesives. Anything with chlorine will give off toxic gas.
One of the things I am going to explore is the properties of different materials when cut and etched with different settings. I have been talking with my forestry and building trades colleagues about the properties of different woods. It is a fascinating science all on its own! They are going to keep slices from trees they cut down so I can etch them with a silhouette of that species and the name and maybe a leaf. It could be a cool display.