Thank you for all your suggestions... I kinda ended up just doing what i wanted to do. lol
He really didn't want white frosting wanted chocolate, so I tried going green with chocolate frosting that didn't work at all.
I made a few with chcolate frosting & I minced up green licorice whips & mixed with green sprinkles for grass... then topped with half a gummy earth worm. I will say again the Gummy Earth Worams are gross, I think they were grape flavored? I licked the package one came in, couldn't bring myself to taste the actual candy.
the rest I frosted with chocolte then rolled in oreo crumbs then put a worm on top. I want to make again using coconut as grass, but he is allergic to coconut so I didn't do that this time.
I did other other cup cakes for party that I made a white cake mix with mixed berry sparkling water, added purple (red + blue) food coloring to batter. Frosted with white frosting & used gum drops & M & M's to make flowers. Also added M&M lady bugs & bees like on the sunflower cupcakes, the girls & mom's at party loved them!! http://www.craftster.org/forum/index.php?topic=240213.0
also did some red, white & blue layered batter cupcakes. They were cute, my white layer puffed up so they all had a white bloch in the center lol but when cut in half, or with a bite or two taken out of them they looked cute. I did just a dllop of frosting on the dop with a few red, white & blue star sprinkles.