Use tip 2 or 3 and individually pipe each blade of grass!
I just saw a good idea in one of Debbie Brown's books - pressing the star tip into fondant repeatedly to give a grassy appearance. It works on fondant so why not give it a try in buttercream? Dip it in and "pull" up the blades.
Or a rough layer of frosting with just the occasional bunch of blades sticking up.
I guess it depends on the cake!
Good luck!
Use a leaf tip to cover a lot of ground, just pipe them straight up. Then fill in with the round tips maybe.
I mean if the area is colored green already, if you just do groups of three blades of grass, you got the point across.
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