Mkay I have no idea if this work in Maya but in 3d max I usually create several planes with differant maps (different color of grass in this situation i guess) and make noise opacity maps so that you see through them(Except the last one of course!) that makes a groundish look, and it is reapatable becouse you cant see the edges. For the twigs, model them quickly and add a simply bark bitmap or something. (Dunno if this works in Maya tho)