Fresh Grass on Suspension?

Hit the model railroading section at your LHS. They have a horde of good stuff for landscaping and what have you.

hehe, you can even use real grass.
If you have a lawn, or there is a lawn being cut, gather some of the clumps of cut grass, the really mulched stuff, and wait for it to completely dry out, then just sprinkle it on your mud, or mix in.

cisal rope or twine, frayed and trimmed and then mixed into your mud.
static grass
horse hair (o.k. a stretch I know but I have a horse so...)
old paint brush bristles
the usual grass stuff.....

Mike

thats what I used on my just completed king tiger and willys jeep, the pics are floating around the forum somewhere.

Woodland scenics makes a good static grass product. You could cut it to whatever lengths would be appropriate for your build.