It's not a dumb idea.
Though, clouds, known as fog is being worked on Kingdoms, as a part of weather.
Weather will include clouds/fog, rain with thunder, wind which I guess will make the smoke blow from the smokestacks on Kingdoms, can also use rotate effect to make the trees move back and forth, hurricanes/tornados, flash floods, which I have no clue how it will work, as well as the good sun.
I think the "cloud" idea would make it seem like giant weather clouds will be over certain places on Kingdoms, which weather will be below the cloud, travelling around. Of course, there would be more than one cloud. Stefan had this idea or so.