Over the past couple years I've been saving my empty ink pots (I go through a lot of Brown ink when basing Models) so I always have a few empty pots laying around. When you make as much wash as I do, it's handy to have.

These are the colours I'm going to be using to make my wash, along with an old paint pot.

I'm going for a light brown/green colour. Not at bright green as my previous washes. The final colour is really just trial and error, adding more of one paint or another until you get something you like.

So I start with the empty pot and fill it about 3/4 of the way with water.

Then I start adding paint. For each addition, I add about 4 or 5 'brush fulls' of water (A brush full is just dipping your brush into the paint and getting as much as you can out. You'll see a pic later)

In no particular order, I first I add some Snot Green. This is used to get a nice green tint to the final product.

Then some Scorched Brown. This gives us our brown base colour. You can see what I refer to as a 'brush full of paint' here.

Mix it up a little (it looks really brown, but that is just the paint sitting on top of the water, I didn't realize this until after I took all the pictures.)

Then the Cammo Green (once again, not mixed well so it's sitting on top). This will lighten the overall wash a bit, gives it a nice effect.

After adding some Black Ink and mixing it a little better, you can see the colour start to get much better. It's getting close to what I want.

I think I added too much Brown Ink at this point.. it really drowned out the green.

So I test it just to see how it looks.

Very brown. Almost looks like pure Brown ink... (Looking back, I probably just didn't mix it well enough...)

To fix this, I add more Snot Green. It's a strong colour so it should take care of it.

Starting to look done.... so I test it again.

Much better! I'm happy with this.
(at this point, I recommend using a little of the wash on your model in a inconspicuous spot, just to make sure it will look good before covering your model)

The final addition is an important one, a little Future Floor Wax. I add a single brush full for the entire pot. It's more than enough.

If you don't add something to break the Surface tension of the wash, it will pool like an ink would. This doesn't cover the raised areas well. This wash without the wax would do this:

Which is fine if you're inking something, but we want good coverage.

Lastly, I close it up, give it a good shake... and we're ready to go!

Beautiful! I'm ready to break out the tank brush!

All you need to do is slop this crap all over your model. Don't worry about being neat.

Try to get the majority of the model on the first coat. You'll probably get a lot of air bubbles which cause white spots. You can always go back afterwords and re-wash areas (like I did after taking these photos!)

WARNING! THIS MAKES A MESS!
You probably want to put something down as this will run all over the place. This is why my desk is such a mess.

I barely got any on me this time. (it washes off really easy)

Nothing more to do but sit and wait for this to dry.