1Heat oven to 350°F. Place paper baking cup in each of 48 regular-size muffin cups. Make and bake cake mix as directed on box for cupcakes, using water, oil and egg whites. Cool 10 minutes; remove cupcakes from pans to cooling racks. Cool completely.
2Place cupcakes on platter, fitting snugly together and forming rectangle. Frost cupcakes with 1 container of frosting. Refrigerate 30 minutes. Tint 1 container of frosting with green food color. Tint remaining container of frosting with blue food color. Spread green frosting over cupcakes, leaving 3 cupcakes white in each of 3 corners. Frost the 3 corners of white cupcakes with some of the blue frosting. Arrange fruit chews on cupcakes to look like walkway. Fill ice cream cones with remaining blue frosting; top each with a gumdrop. Place ice cream cones in one area. Stand chocolate pieces and candy canes in other corners. Arrange lollipops to look like a forest. Place remaining gumdrops randomly on cupcakes.