I always base my figures with sand and loose vegitation.
It works out well. The only time it looks a little odd from an astetic point is when the characters are on board a ship but usually the bow of the ship obscures the base.
I have a very simple basing method I've used over the years.
I have two plastic bowels with lids. One contains sand gathered from a sandbox at a local playground. There are usually very tiny stones mixed in here which look great. Don't use dirt. It has too much organic matter in it. The other has assorted fine cheap herbs (from the dollar store) and a few tiny pieces of static grass mixed in.
I cover the base with a generous quantity of white glue (PVA) whatever you call it or brush it on after the figure is painted.
Then I dunk the base of the figure in the bowel so that the base is submerged in the herbs. Then I immediately dab and shake some of the loose matter off off. Without applying more glue I then do the exact same with the sand container and shake the loose material off.
While the material is still wet I adjust the vegtable material with a small sharp object pointing the grass and weed pieces straight up. The end result appears to be loose patchy vegitation growing up through the dirt.



