After finding GIB to be too messy and uncontrollable, I decided to try DAS clay with my airborne forces with acceptable results. I use the round end of a paintbrush to give the 'earth' a walked over effect.
Next I paint the base with flat earth.
Then I highlight with Green Ochre.
Next I add some model railway gravel with PVA glue.
Then it's time for the Static grass!
And finally a little bush on each base.