Create a vibrant and whimsical bubble-themed background featuring a variety of colorful bubbles of different sizes and opacities drifting gracefully across a soft, dreamy pastel gradient. Incorporate a subtle sparkle effect within the bubbles to enhance their three-dimensional appearance, and add reflections and highlights to create depth. The overall composition should evoke a sense of playfulness and lightness, perfect for a cheerful wallpaper design.

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Create a vibrant and whimsical bubble-themed background featuring a variety of colorful bubbles of different sizes and opacities drifting gracefully across a soft, dreamy pastel gradient. Incorporate a subtle sparkle effect within the bubbles to enhance their three-dimensional appearance, and add reflections and highlights to create depth. The overall composition should evoke a sense of playfulness and lightness, perfect for a cheerful wallpaper design.