This is my first attempt at creating an army for picture wars. The blue ▲s are civilians, who are the equivalent of a builder/gatherer. The red ones are warriors, and the green engineers (who build mechs and most machines). the white/transparent ones are children, who grow to adults in one round.
Picture Wars site and guide, respectively:
The guide is somewhat out of date (for instance, I have never seen power jelly), but should, after also watching some battles, help you get started.
Edit: updated the spritesheet
Edit2: Sharpened sword, reduce to one floor/wall/ceiling block (also has bevel shading), and added mech