Blue is a photo of some interesting cloud formations in a really blue sky.
A few keywords related to this image are blue, sky, skies, cloud, cloudy, clouds, pastel, color, bright, billiance, sun, sunny, day, daylight, dayscape, twilight, morning, sunrise, rising, sol, ra, formation, atmosphere, environment, background, skybox, skyscape, storm, stormy, rain, forecast, weather, blue, white, fluffy, puffy, cumulus, fog-like, skywatch, wind, windy, drift, drifting, organic, overcast. cloudscape, organic, soft edged, blur, sun, obscure, backlit, white, radiant, glory.