Not total variations, but more subtle ones like you both described. They have been in the hobby a long time, so I imagine some degree of color morphs have been acheived, but if so, I havent seen them.
Also, when the fry are growing up, the stripe down the side can look really blue. Makes them look a lot like skinny neons. Mine breed all the time, but I've only raised 3 more or less succesful broods.
I have 2 tanks full of white Clouds, love the little buggers.