Dunno about the easiest way, but yeah - that's the normal way that say Army would do it - base colour, then the other colours over the top. Also it's usually done so the splotches get smaller with each colour, so for a 3 colour job with brown, black and green the brown splotches were painted over the top of black splotches, which were painted on top of the green base. Means that the finish isn't exactly smooth.
I guess depends too on what sort of look you want - if you want a historic style like the Wehrmacht used to have on Kubel's and stuff it'd pay to get a few Military Modelling magazines or similar to use as reference.
VWDCQ vice pres & web dude - vwdcqinc.org.au
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'70 Hillclimb Bug 'Jezebel' w/- Haltech EFI -
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'60 KG Coupe - resto kinda started
01 New Beetle - gf's car, but I turn the spanners
