Time for a flashback, since I'm uploading this on Traditional Tuesday. One of my first movie projects was this take on Superman written by JJ Abrams and to be directed alternately by Brett Ratner & Mc.G. While it never got off the ground, it did give us the opportunity to generate some cool Kryptonian tech, including this battle pod flown by the minions of Superman's evil cousin Kata-Zor as they scoured the galaxy in search of the prophesied savior of Krypton, one Kal-El.
Back then my primary media was a fist full of markers, laid wet-on-wet on bond, marker paper or vellum, whatever was handy. It tended to mean working very fast to get a nice blend, which led to a lot of happy accidents when a darker color was grabbed inadvertently, forcing me to work bolder than I would normally choose.