Hi guys, I made a little tutorial to show how I did my mars bases.
Its alot like how GW did theirs except a different drybrush and techniques to make it look more rugged.
Charadon granite (or mix alot of black with a small amount of brown and grey)
Tau Light Ochre
Step 1: using white glue, apply some rocks and sand in a random pattern on the base. When the glue dries spray it with black primer.
Step 2: Paint the top of the base with a solid coat of khorne red (might take two coats)
Step 3: Paint Martian Ironearth over the entire base
Step 4: After the martian ironearth dries, paint a couple rocks or about half of them with charadon granite (which is like a dark grey color) the main point of this is to break up the monotony of the base.
Step 5: Drybrush the dark grey rocks with martian ironearth, leaving some charadon granite showing.
Step 6: Drybrush the entire base with Tau Light Ochre, which lightens the entire base and adds detail.
Step 7: Finally, paint the rim of the base Doombull Brown, and the base is finished.