Alec - you refer to my example?
In any case, here is what I do.. and you can vary the hue of the wood "color".
1 - I airbrush a couple of thin coats of model master WOOD (enamel) as a base.
2 - let it dry thoroughly
3 - Give it a nice coat of Future/Pledge
4 - Let dry for a couple days
5 - Now you can use oils to simulate the grain of the wood. I use Winsor & NEwton oils (I get them cheap at Michaels art supply store).
6 - Add a small amount of the oil paint on one edge/side of the base, and using a stiff square brush, "rake" the paint across the surface.. this is what gives it the 'wood grain" structure. Play around a bit; the great thing about this technique is that the paint is 'wet", so you can wipe out what you dont like and start again. You can even flick your wrist a bit at the end of one stroke to create a "whorl".
7 - Vary the shade by using different oil paints. Burnt Siema, burnt umber gives you different results:

9 - Once you are happy with the result, let dry for a few days (main drawback of the technique), seal with another coat of Future/Pledge and youare set to apply decals (nameplate) or dullcoat a bit to reduce the shine.
hope this helps!