I have done grass using a gumpaste/fondant blend... a little bit more gumpaste  than fondant. After coloring it with the color I wanted, I rolled it out very thin.  I initially cut  a strip to the height and width of the grass clump I wanted. Then, I used and exacto knife and cut the individual blades of grass, and bent some forward, gave some a little curve to make it look realistic, and then put it on the cake.  My cake was buttercream, so I just kind of set it into...