The new CADPAT that M1 referred to can be seen on the Canadian army's website:http:
//www.army.forces.gc.ca/lf/English/2_0_68.asp?uSubSection=68&uSection=3 for the woodland or
http://www.army.forces.gc.ca/lf/English/2_0_67.asp?uSubSection=67&uSection=3
for the arid region.
The technique I used to paint was to take a saml piece of manila paper, and using the tip of a number 11 knife, cut a small (1mm or even smaller) square in the paper. Then, with an airbrush and lightly thinned paint, dust the colors of the camo through the mask onto the figure in the pattern you want. It should work for the new marine camo too.