For a traditional look, Shutterstock offers a variety of "hovering" cloud styles with soft blue backgrounds.

These options feature a clean, vibrant aesthetic typical of modern animation:

Finding high-quality wallpapers for "Cute and Puffy Cartoon Clouds" is easy with these curated options. Most of these are available in or higher resolutions. Cartoon & Animated Clouds

Sites like Wallpapers.com feature artistic, watercolor-style clouds in pink, purple, and blue hues.

For a bit of personality, Freepik features "smiling" cloud illustrations that add a friendly touch to your screen. Pastel & Aesthetic Clouds

Vecteezy has "fairy-tale" themed backgrounds that include subtle star elements and gradient skies. Visual Inspiration Grid

If you want a more minimalist or patterned look, Dreamstime provides seamless cloud patterns perfect for desktops.

For a softer, more calming vibe, these pastel-colored backgrounds are excellent: