I got these 25mm Ground Zero Games Stargrunt vehicles in trade a while back. I had intended to trade them up for the 40k rules, but procrastinated-- a good thing, since the new version was coming out. Anyway, the main reason I held off painting them is because I just don't paint vehicles. I've never been any good at it, and was frankly hesitant to do it. I took them as a challenge, and I think that the results of my attempt are good. See for yourself how I did it.
First, I cleaned the vehicle and primed it. I actually dabbled with priming white or black, but the spray paint I used covered so well that I couldn't tell any difference. Thus, most are just primered white.
Next, I spray painted the vehicle a sold color-- in this case, Testor Model Master's Afrika Mustard. I then masked off large, irregular areas with torn pieces of card stock. Some are white and new, others have already been used and are thus olive drab.