Pulling a description of said suggestion from a comment by Redrobes, because I think he said it nicely.

Quote Originally Posted by Redrobes View Post
... You know we should have a challenge based around a real world bit of noise pattern like coffee or the eye iris recently posted and make a map from it. You should have to post the original noise source unless its fairly obvious like in this case. (http://www.cartographersguild.com/sh...oo-Much-Coffee) ...
I did see Jax's suggestion for clouds, but this is more broad in allowance of source material for those people in deserts who have no clouds. You can still use clouds if you'd like to, but anything goes. But, Jax is still awesome!