Also remember that camouflague is designed to break up outlines. There is no point painting splats
fo colour in the middle of big armour plates (unless you're after a cow effect).
Have the disruptive pattern connect to edges and cover corners and anything else that might be viewed as un-natural.
I used this approach with both my Tau and Guard as below for pretty good results. Another good thing to do is just google for camouflage until you find something you like.