Well here is my first airbrush attempt (Mardave Fiesta shell):
Design was inspired by a google images search so I can't take credit for that. This was an exercise in using the airbrush for me and I'm quite pleased with the results!
All masking was done using masking tape, and only the candy blue, orange and black shadows were applied using my airbrush/spray gun. The rest (including the chrome) was by rattle-can.
Some obvious mistakes in masking, and some bits didn't turn out like I'd hoped. Next time I'll try using liquid mask!