I 2nd the previous poster. Tip #233 works great!
The average seems to be tip 233, I had the same query a couple of weeks ago. The alternative also is to push fondant thru a sugar gun or garlic press.
I just thought of something else. You could use a small leaf tip and have bigger blades of grass. Tip #73 possibly. I would hold the tip at a 45 degree angle from the surface. Or you could do a manicured lawn where they have the rows of grass. I'd use two slightly different shades of green and use the serrated edge of the basketweave tip. I hope these makes sense to you.
Someone just posted this cake with grass:
http://www.cakecentral.com/modules.php?name=coppermine&file=displayimage&meta=lastup&cat=0&pos=-34972
It looks like they just used a star tip and I think it looks pretty good!
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