I tried to join the cloud appreciation society recently. Its costs a mere five quid or so, and you get a badge and info about cloud phenomena. The computer, however, decided not to allow the transaction — will try again soon.
Here's a good one. Seen on the coast near Narbonne, a wonderful area of etangs, scrubby landscape and leggy flamingos.
I think it looks like Maggie Thatcher, or a vast furry anvil.
The best cloud description I ever heard was from Ezra when he was about five: That one looks like Daddy eating a piece of cake.