hmm well the bases will probably still need to be some flavor of bark and cork. it does make some of the best rocky outcropings outside of sculpting it by hand with mill put.
then we got

and
from secret weapons
from kromlech.
any number of fantasy undead horses and dudes.
get tan grass tufts, twigs and branches for tree parts.
and

texture paints from geedubs.
personally if i was doing it
id start by super gluing bark nuggets to build out the rocky areas, glue down detail pieces like skeletons, skulls smaller rocks, and dead wood.
back fill with spackle or millput. prime white to make it brighter, then paint the rocks a dark burnt umber, dry brush a little brighter, paint all the bones and details, then paint the sand areas close to graveyard earth, maybe a little darker.
then go over the sand area with algrillen earth from
gw. let it crackle then dry brush it with a tan, seal, glue some grass tufts in the cracks and call it a day.