These look great.
I can't remember, what did you use to add texture to the foam?
the foam itself was just cut using a hobby knife. I used spackling compound on the bases to seal the foam to the cardboard to give the pieces more weight and a little more adhesive than just the glue. the compound goes on very thick though which can be formed into patterns..... then sand is glued on and painted over.
That's a great set of scatter terrain - they look very useful for games! Will you play that models can move over them, or will they block movement?
they will do a little bit of both..... generally I play this type of terrain that a model can either climb over it, or stand on it if able to balance on the piece. the standing stones themselves would be impassable, but models can pass through or stand on the bases. usually I like to play casual and see what works with the game..... Devanu would have no trouble with this terrain, while Fubarnii would need to work a little on the pieces larger than themselves. we would set conditions before the game begins
mostly depending on the scenario.
They sure give your table a rugged mountainous look.
You can't have enough like these as you can easily put some of them on top of each other as well.
they're not terribly exciting to build, and always take longer than expected, but they go a long way to filling out the table by just throwing a piece or two here and there to give the world some flavor.