Craft a collection of childlike watercolor clipart birthday motifs that exude a sense of innocence and joy. Embrace a soft and dreamy style, reminiscent of artists like Mary Blair and Shirley Hughes, to evoke a nostalgic feeling. Incorporate charming elements like colorful balloons, confetti, cupcakes, and smiling animals, all portrayed with a gentle and hand-painted aesthetic. Let the colors be bright and lively, reflecting the exuberance of a child's birthday celebration.