Harking back to the late-80s glory days of the style, McFarlane is next month releasing a line of Halo toys called "Micro Ops", tiny little 1:100 (or around 15mm each) figures designed to let you recreate actual Halo battles, and not just actual heroic poses.
The first series includes several different figures, vehicles and even a couple of playsets. You can take a look at some images below.