There is a collection of terrain mats called 'SERIOUSLY REAL' by  Jonathan Allen. I'm not sure if they are in the Freebies section or at DAZ3d.
I've used them in a couple of unpublished pieces and they are amazing.......

Available on Amazon for the Kindle E-Reader

All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...