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Paint the surface with two coats of sky-blue latex paint. Let dry.
Dip a sea sponge into a bowl of water and squeeze out the excess. Dip the sponge into blue-gray latex paint and dab off any excess. Begin your clouds by randomly dabbing the paint across the sky-blue surface. Clouds begin to appear as blue-gray paint is dabbed across the blue-sky background.
While the paint is wet, gently dab a piece of cheesecloth over the entire surface. This softens the edges.
Repeat the procedure with a light-blue latex paint, dabbing over areas of gray. Don't let the paint dry between shades. Don't cover any painted areas completely -- let some of the sky-blue and blue-gray colors show through. With a piece of dry cheesecloth, smudge the light-blue painted areas while wet.