Lelle...
here's a tip for ya regarding camo...
take the tank.
color it in one tone. (i.e. remove the camo)
then make mulitple copies of said tank and brighten and darken them a few times. (using the same pallette regestries obviously)
then with say... three or four (at a push variations) you can cut out sections and paste those sections on top of the original (single colored) tank...
you can go crazy with this so be careful...
check these droids (not mine) that I camo'd up in this fashion a while back...


(I'm sure someone round here'll remember who pixelled these puppies) all I did was camo them up... personally I prefer the angled camo... the germans invented it during ww2 and I think it's called 'splinter' these days...