For those who are interested, here's a quick walkthrough of how I am basing the SG teams. The bases themselves are 3/4" fender washers. I filled the hole with wood putty then glued a figure on it with white glue. Once that was dry, I built up around the figures' cast on bases with Golden's "Light Modeling Paste". The paste dries white, so I painted it brown.
To texture the surface, I used white glue and Woodland Scenics railroad ballast and earthblend turf.
I put together a magnetic stand that I used while painting the bases and putting on the ground cover. It's simply a small wooden spool I got from Michaels, with two holes drilled in it and two magnets glued in the holes. It holds the figures firmly while I'm working, and I can move the figure around however I need without worrying about getting my fingers into the areas I'm working.
First, I paint the base with undiluted white glue. I do my best to not get any on the figure (I think I failed in this photo); if I do, I clean it up with a clean wet brush.
Next, using the scoop end of a sculpting tool I pick up some of the ballast and sprinkle it onto the base.
I'm not going for thick coverage, just a scattering of rocks on the base.
Once the rocks are in place, I drag the base through the turf flock.
Then I turn it sideways and firmly tap on the bottom of the base a few times to knock all the loose flock off, and I'm done.
The process goes pretty quickly, maybe a minute or two per base.