Just a little video on how I go about basing my models.
I find some sand in the back yard, make sure its fine sand. Bake the sand at about 225'F to kill any nasties in it. I'll water down some glue and brush it on the base then dip the model's base into the sand. Shake off the excess and you're done. Paint it up add some green stuff vines if you like, have fun with it! remember to try this before you base coat your models makes life much easier.