Maybe you know clouds better than I do - did you know there is a Cloud Appreciation Society where people submit some of the coolest cloud photos you've ever seen? The contributors collect points when they submit their photos, for instance, a photo of a nacreous would be 45 points whereas a more common cloud like a Cumulonimbus would only grant you 35 points.
There are 10 main types as well as many others I have newer heard of or seen in my life. If you check out the website you may get lost there for a while. Here are a few new ones to me.