Here are two other techniques I look forward to trying with my GF: TSP (Traveling Salesman Problem (yes, really!)) and Stippling. Both techniques are useful for devices such as laser cutters, as they don’t depend on true greyscales.
In case you’re not familiar with these, here are a couple of examples:
NB: The techniques involved require at least a passing knowledge of image manipulation and depend on user-installed programs, so I’d say these might be intermediate-level projects if one has never worked with them. YMMV, of course!
You can also engrave far enough into acrylic that it will hold paint. That means your designs can be as many colors as you like!
Engrave one layer, use a squeegee to fill the engraving with (laser safe) paint, then engrave the next.
I am hoping that I can engrave right through the paint.
Yes!! One of my architecture studios made a whole tray of stackable maps that way! Each team focused on a unique aspect of our site, and we displayed them on separate sheets of clear acrylic- my team squeegeed black paint into engraved lines to make our base site map before applying other colors to new diagrammatic engravings on top. When all the sheets were stacked, you could look through and see each team’s site analysis!