I've got this idea for 'Tinker, Tailor, Soldier, Spy'. Here's Tinker. I know the objects he's got don't look like Erector set bits but that's what I was thinking of. This is just a sketch in watercolor -- not really! Color! Not pencil doodles! Not sure how to finish it, but right now watercolor pencils might be the thing to try. Neither regular color pencils and computer painting seem like the way to go with this.