Preheat oven to 350° F. Prepare, bake, and cool cake as directed on box in two 9-inch round cakes. Reserve 1 of the layers for another use or to make a second bunny cake.
Lay 1 layer on counter and cut in half, right down the center so you will have 2 pieces the same size. To join the two pieces together, lightly frost one side of one of the half layers, then lay the other half layer on top of it, aligning the rounded edges on top. Stand the cake upright on cut edge on tray or covered cardboard.About 1/3 of the way from one end of the joined cake, cut out a notch through both layers to form the head (small end). Use half of the cutout piece for the tail (I broke the point off); attach it to the back of the long end with some frosting (can use a toothpick to secure, if needed). Frost entire cake, then lightly press coconut into the frosting.
Cut out ears from paper of choice. Color the centers of ears pink. Wrap the ends that will be inserted into cake with foil or plastic food wrap. Push ears into notch on top. Attach jelly beans or gumdrops for eyes and nose. Decorate the bunny face with jelly beans. Stick toothpicks into the cake on both sides of nose for whiskers, if desired.
In a mixing bowl, stir together 1 cup coconut, and 2 to 3 drops green food color until well blended and colored. Surround bunny with the green coconut; then decorate with additional candies, if desired.