Cloud streets over the Caspian sea. (Modis Website)
The Modis Rapid Response System’s website releases beautiful images that it captures of our planet at least once a week (if not more often). Check out their gallery (which also contains an archive of all their old imagery) http://rapidfire.sci.gsfc.nasa.gov/gallery/. The satellite images released are mainly of weather related phenomenon and fires as the system is used by U.S. agencies to monitor fires as well as weather patterns as related to agriculture.
The Moderate Resolution Imaging Spectroradiometer (MODIS) flies onboard NASA's Aqua and Terra satellites as part of the NASA-centered international Earth Observing System.