Bake and cool 1-layer cake. Ice smooth in blue. Cut 2 in. wide green stripe strips; attach around cake sides using piping gel, trimming as needed. Cut two large light green hills 7 1/2 in. wide, 3 to 3 1/2 in. high with a wavy top edge; attach starting at bottom edge of cake. Use green FoodWriter to draw e-motion border on hills.
Cut dinosaur using bright green. For body, set Circle Cutter to 9 1/2 in. and position in center of a long edge of full sheet; cut semi-circle. Position on cake 4 in. from left edge, 1 1/4 in. from bottom edge. Cut head using second smallest nesting Circles Cutter; attach. Use pattern to cut two legs (do not attach). Use light green Sugar Sheets! and rotary cutter to cut two small hills 7 1/2 in. wide, 1 to 1 1/2 in. high with a wavy top edge; attach starting at bottom edge and overlapping part of body. Attach legs. Cut 10 purple back spikes 1 x 1 1/2 in. high; attach. Use punch with smallest Layered Circles Insert to cut five bright yellow spots; attach. Cut white eyes using wide end of tip 5; attach. Use black FoodWriter to draw pupils, toe details and smile. Cut white eye highlights using narrow end of tip 5; attach.
For clouds, cut three strips 2 1/2 to 3 in. wide, 1 1/4 to 2 1/2 in. high. Use Border Punch Set with Bubbles Cutting Insert to cut curved edges. Attach message.