Design lovable illustrations of monkeys in various poses and expressions. Focus on their expressive faces, big round eyes, and mischievous smiles. Incorporate different types of monkeys, such as the capuchin, spider monkey, or marmoset, to add variety to the clipart set. Use a vibrant color palette to make the monkeys visually appealing. Consider adding playful elements like swinging from vines, eating bananas, or wearing cute accessories like hats or bow ties.