Smoke Wings

I want to be able to fly, and any style would be awesome, but there are some that I like more than others. The one I want most is to generate some sort of enchanted black smoke-like substance and shape it into wings, with which I would fly. I would also enjoy eagle or demon wings, but what I really want is for wisps of black smoke to thicken and form wings that I could dissipate and reform at will. I also want to be able to make other things out of it, like a cloak or a shield, or tentacles.