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Got inspired to colorize a model without using paint.
I've got a list of materials I plan to use including tree sap and coffee grounds as staining washes. The only non paint item will be matte coat spray.

What I need help with is how to do a decent base coat that will be whitish in color. Stuck on this one. Lime? Corn starch? The matte coat should help lock in this layer, but we shall see.

Do any of you use non standard painting techniques? If so I'd love the input.
Don't ask why, or say its ridiculous. Just ideas, please.

You could try chalk mixed with water for the white base coat

Ask Doomthumbs, he painted a mini using various bodily fluids.

I just cant help but ask why.

But it is your model.

chalk, baby powerder/talcom powder, baking soda can get you white pigment you will just need a way to bind it to the model.

Edit: though thinking about it you could do a base coat of white on some daemons, then wash them in beat juice for red, grean tea for green boo berry for blue and so on, would be kinda cool. (damn hippy daemons)

Yeah, I'd say ask Doomthumbs but I'm quite sure he's gone...

Go do some research on natural pigment sources for your colors, and old fashioned homemade paints. It'll be a good time, until something starts molding...

http://pinterest.com/pin/164522192608218699/
http://babyparenting.about.com/cs/activities/a/paintrecipes.htm
https://www.ischool.utexas.edu/~cochinea/pdfs/a-baker-04-pigments.pdf

Other than that, I'm thinking...
-black coffee/tea for a devlan mud wash (or similar). Or dry coffee/tea for brown.
-Blueberries for violet
-Whatever flowers might be blooming for whatever colors they may be
-Grass for the green chlorophyll
-Rust for red
-Ground metal for your metallics (if applicable). You can break open an Etch-a-sketch for easy access ground aluminum.
-Coal for black
-If you can get your hands on it, sulfur will work for yellow
-Can't really think of any type of blue other than from flowers.
-Chalk for white.

Then, I'd personally do the tricks listed in the links above to make an Egg Tempera paint, and try that. Then maybe, if you're lucky, it'll hold and stick and not mold and such. So long as it dries properly. Then matte coat it and you should be on your way to an all-natural painted scheme.

"Lead White
2PbCO3•Pb(OH)2
This pigment has been used since classical times, and was prepared by suspending strips
of lead above vinegar or urine in a vase, sealing it and burying it in a dung heap for several days."

Oh MAN. How can I pass up that opportunity. I'm stripping an old lead model TONIGHT!

Back in the old days, American farmers used to make paint from spoiled milk. Livestock blood was often added to dye it red.

It was made to stick to wood, and you may still find traces of it on old farms and antique furniture. No idea if it would stick to plastic though. (BTW, you can make plastic from spoiled milk too!)