My dad loves boats. Boats of almost any size or shape as long as they have sails and some teak. I don't think he would consider himself artistic, but he can always be counted on to draw his latest nautical crush (or electrical diagram or neuron pathway) in perfect detail from memory with his favorite black pens. I love these little sketches!
A couple years ago, he sketched a particularly nice motorsailer on the back of a pharmaceutical notepad. I snuck it away and took it home where it lived in an enveloped marked "do not throw away." Just last week, I had it formally framed at the shop down the street. It is hung in my front entryway as a reminder of the importance of having passions in life.