In a small screw top jar combine the few drops of water and the green food coloring. Add coconut; cover and shake until all of the coconut is tinted. Set aside. 
Turn oven to 350° F. Follow directions below for assembling cookies, using vanilla wafer and peppermint patties. 
Brush tops with water and sprinkle with sesame seed or poppy seed. Make 24 cookies. 
Place half the vanilla wafers, flat side up, on an ungreased cookie sheet. Top each with a chocolate covered peppermint patty.
Place in the 350° F. oven about 1 minute or just until chocolate begins to soften. Sprinkle each with 1/2 teaspoon tinted coconut. Top with another vanilla wafer. Press gently.
With a clean paint brush (small), pastry brush or your finger, brush the top vanilla wafers with just enough water to moisten, so the sesame seed or poppy seed will stick. 
Sprinkle each cookie with a little sesame seed or poppy seed and serve.