A couple card designs based on one I made for my grandpa a while back. He's a retired engineer, a lifelong tinkerer, and holds a few patents. The design is based on exploded diagrams, which are frequently found in patent drawings, manuals for machinery, and the like. They give me a feeling really similar to cutaway illustrations, which I always loved as a kid (and still do!) -- getting to peek at how something is put together, in a way that makes all the parts distinct from each other.
These are available as print-at-home cards in my Etsy shop, and I'll be adding printed ones available for shipping soon. So, keep me in mind for all your engineer/industrial designer/architect/patent lawyer/diagram-loving friends and family birthdays. 😘