Yay pigs!
There's the only picture I have of my pigs on-hand... I was just getting back into the hobby at the time so I decided to go with a more generic-y base- Cork Rocks, gravel painted in Desert Colors with Green Static Grass.
I always thought a sort of scrap heap basing theme would be good for pigs, and fit their overall steampunk nature...
Sort of like this:
or, on a bigger scale, like this (minus the obvious 40k Elements):
Edit: YIKES! Picture sizes. Let me see if I can fix that.