If you're stuck without any clouds you like, an extremely broad source of mediocre cloud photos is Google Maps. Pick a random road, go to street view, and pan up. On the positive side, it's always daylight :-) and they don't take pix in truly lousy weather. On the down side, the resolution is low, roads are often surrounded by trees and power lines (tip - try rural interstate highways), and they like high sun angles, so there's usually a big ol' sun-glare in the picture. Chances of clear skies are probably even worse (for our purposes) than a random day at the location, and evenly overcast days won't do us any good either. AND the photos are copyrighted, so one ought not use them in public (like this contest...). If you are desperate for some fluffy randomness for your own use though , there's fourteen gazillion clouds to choose from.