Make mask: Using template, cut cardboard into a wide triangle shape larger than your child's head, rounding the edges. Trace cardboard shape onto green felt, adding two inches all around; cut out. Coat cardboard shape with spray adhesive and center felt on it, stretching it over edges. Use half of a plastic sphere to trace eyes onto triangle shape; use knife to cut out eyeholes. Using a plastic sphere, measure and cut two half-circles of green felt for eyelids. Spray each half-circle of felt with adhesive and place over part of each sphere, stretching felt to smooth out any wrinkles. Hot-glue finished eyes to mask's eyeholes.