Washes / dips are the quickest way to get a great result. Washes (or inks) tend to be water soluble, dips tend to be varnish based. If you can drybrush as well, you can get very good results quickly. I can go on more about this if you're interested.
The Whisky Rangers sound like they should be a brown or tan based unit. Add a contrast colour for detailing. For example, this homebrew merc unit of mine, Ōkina Shigoto.
Simple scheme - tan base, green stripe on lower right leg, camo triangles on the upper shoulders, and then a coat of teak stain. The stain pulls it all together, and pools in the panel lines & adds detail. It also pulls away slightly from edges - see the paler lines on the Ninja-To's shoulder panels - adding further detail for free.
In your case, pick a contrast colour that suits your needs. Pretty much anything will do, and apply it in whatever pattern you chose.
Alternatively, countershading looks really good:
These Capellan Dragoons are half black, half green, with black details on the green side & vice versa. Again, choose colours you like.
Hope that's some help.
