Building Blocks Cakes

1 box cake mix (any flavor)
Water, oil and eggs called for on cake mix box
Tray or cardboard, 15 x 12 inches, covered
2 containers (1 lb each) Rich & Creamy vanilla frosting
Red, yellow and blue paste food colors
12 large marshmallows, cut in half crosswise

Heat oven to 350 degrees. Grease bottom and sides of 13x9-inch pan with shortening (do not use cooking spray); lightly flour. Make cake mix as directed on box, using water, oil and eggs. Pour into pan. Bake as directed on box. Cool 10 minutes; remove from pan to cooling rack. Cool completely, about 1 hour.

Using serrated knife, cut cake crosswise into thirds. Cut one of the thirds in half crosswise to make 2 squares. On tray, place cake pieces. Cover; freeze 1 hour or until firm. In small bowl for each color, tint 1 cup frosting red, 1 cup frosting yellow and 2/3 cup frosting blue with food colors. Leave remaining frosting white.

Frost top and sides of 1 square cake with blue frosting. Frost 4 marshmallow halves with blue frosting; place in square design on cake. Frost remaining square cake and 4 marshmallow halves with white frosting; arrange marshmallows on top of cake.

Frost 1 rectangular section of cake and 8 marshmallow halves with yellow frosting; arrange marshmallows on top of cake. Frost remaining section of cake and remaining marshmallows with red frosting; arrange marshmallows on top of cake. Store loosely covered at room temperature. Makes 12 servings