Create a colorful 2D illustration of a happy, smiling old man holding a soap bubble, surrounded by playful kids' elements. The style should be cartoonish, vibrant, and playful, conveying a sense of joy and whimsy. The background should be PNG transparent allowing the old man and soap bubble to take center stage. The overall mood should be joyful and carefree, with a color palette that features bright and pastel colors such as blue, yellow, pink, and green.