Now of course you can go out and purchase these things off the Internet and part with a fair amount of money for 5 or so bases, however this type of base requires a lot of model preparation removing the base inserting pins into the legs and then drilling the resin bases. This type of effect can easily be achieved with a couple of hours work at a fraction of the cost and I am going to show how I create such bases and how they paint up.
Start by placing a bit of the mixed putty and spreading it across the base, using a small bit of water on the blade of the sculpting tool to stop it sticking to it.
Work all the way around the figures base wetting and smoothing the surface as you go it does not have to be perfect as some flaws add to the character.
As you can see while the milliput has not cured you can correct small errors simply with some water.
Start with a couple of score lines from one edge of the base towards the bottom of the figure then rotate the base and score the opposite side to match.
Next score two more lines in the opposite direction to those done previously and you now have a flagstone effect. leave the milliput too harden for a couple of hours an you can then start to paint it up.
Wash the cold grey once dried with nuln oil or equivalent and leave to dry this serves to define the rougher parts and creates good texture.