I recently finished building Bandai's 1/12 C-3PO and R2-D2 kits. These kits are amazingly engineered and highly accurate! I went for the classic STAR WARS look--weathered and dirty. I was aiming for a mid-movie, "aboard the Death Star" look--hence the dirt surrounding where Artoo's restraining bolt used to be, and Threepio's dented head, as well as the Death Star floor base, with magnets added to help keep Threepio in place. I also built up the alternate hand with the comlink, although I'll usually display Threepio without it, I think. 

In order to replicate Threepio's "dull-with patches of shiny gold" look from the first film, I coated him with Elmer's white glue, then carefully dabbed away bits of it with a microbrush dipped in water. Artoo's blue panels were done in the same manner as the original props--steel blue metal layout fluid laid over an aluminum base (aluminum paint, in my case, rather than the real metal parts of the original props). This color looks a lot more purple than blue in person, so I gave it a coat of clear blue to get the right dark-metallic, blue-purple look.

Love the weathering.   

Resin model kit of a Luminoid from the OUTER LIMITS episode, 'A Feasibility Study'.  Kit manufactured by Dimensional Designs with build and paint job by yours truly.

Resin model kit of the Antheon creature from the OUTER LIMITS episode, 'Counterweight'.  Kit manufactured by Dimensional Designs with build and paint job by yours truly.

Resin model kit of the Mr Trent character creature from the Harlan Ellison-scripted OUTER LIMITS episode, 'Demon With a Glass Hand'.  Kit manufactured by Dimensional Designs with build and paint job by yours truly.