I got a cheap masonite panel...
Broke it apart so it won't look so unnatural as a base...
Built a milliput base to it.. Once milliput cures, it's hard as stone..
I put the head at an angle to make it look old..
Added some tall grass..
and corn stalks...
Put white glue around the base..
Added green grass flock..
I spray painted some light brown and made sure the bottom part of the face caught some brown to make it look like it's dirt..
Added some white glue and added a lighter coloured green flock to make it look like moss built up..
Boom.. done in an hour.. Good enough for a 28mm trooper. I suppose it can be a giant head for 15mm..