I have seen the light for coloring polymers, and it is good.
Whilst browsing the RS forums I frequent, I encountered the concept of Rit Dye, and its effects on plastics.
A trip to Wal-Mart later, I used a tiny bit of this: http://www.ritdye.com/Liquids.126.96.36.199.lasso
(among other colors I bought).
Put some water in a steel pot, nearly boiling, add how much dye I want (the color of the effect will be a bit lighter than the fluid in the pot), and wait for a while, as it colors it.
And got this:
In this last picture, you can see in the storage compartment the original color of the plastic, and how the paintjob I put on the furniture was not affected -- ONLY THE PLASTIC!
It actually DYES the plastic, penetrating into the material:
It works better than paints, in that regard, there's virtually no mess, clean-up, time before you can touch it, etc. And it's really cheap.
You can use hot glue as tape to make patterns, like this guy:
Or just some good tape:
I was just experimenting, as this is my first attempt, but I'm very pleased with it, and may go for a Multicam job in the near future.
The beauty of this stuff is that you can mix fluids, powders, etc. of various colors -- to get the exact shade you want!!!