My ork has urban camo underoos...
http://www.coolminiornot.com/?id=30225
erm, yeah

. It\'s a base colour of grey-blue, with darker grey triangular-ish shapes scattered about, and then lighter grey triangular-ish shapes.
I highlighted the pants as pants first, then painted on the triangles and highlighted them in accordance with both the folds of the fabric and a general overhead lighting.
I\'ve also done desert camo but don\'t have pics - I used a yellow ochre colour for the uniforms, stone grey (greenish grey) for splotches, and a kinda beige brown/flat brown mix for streaks following some of the edges of the greeny-grey splotches. These were highlighted just in accordance with the uniform shape as it was a larger number of figures. The reference for this was a US (desert) army uniform pic I was sent, it comes out pretty close.