More "traditional media" stuff here...
These are pen and marker sketches of some vehicle concepts.
The upper sketch was a large robotic industrial vehicle I did for my own amusement. I have file cabinets full of stuff like this, but this one happened to be scanned.
The lower sketch was for a proposed film based on "A Fall of Moondust" - a novel by Arthur C. Clarke. This was a lunar exploration vehicle called the "Selene" (in the book it was a passenger liner) that could hover as well as drive. The project was never made.
Drawn on 8 1/2" x 11" velum, shaded with Prismacolor markers