Create a set of 3 to 5 cute and whimsical doodles that a bored adult might draw. The doodles should include elements such as mushrooms, line-drawn cars, and poorly but cute drawn dinosaurs. Each doodle should be distinct and playful, with a hand-drawn, sketchy style. Ensure the design has a transparent background, suitable for integrating into a larger design or drawing a maze around. The doodles should fit within a 4500 x 5400 pixels canvas.