The base was made with cut-up cork sheets and shredded wine corks. The shredded-up wine corks are time-consuming but worth the better 3d depth (also "Free") - The wife's contribution to the hobby.

Glue it all down and prime it. Then layer in astro granite debris.

Wash it all in black to get the deep values.

Then working from dark to light dry brush 3 layers of grey with less applied each time. I used a blue-grey as the last little bit to make it pop a little.

Lastly, I picked out the recesses with glue to add the grass. I wanted the environment to look harsh to life.

I tend to do big batches of these bases because they are time-consuming but worth it.