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Ambiance is like many of the other soundscape creation apps I've listed in this gallery, but with over 2000 free sounds that are exclusive to Ambiance, there are plenty of unique soundscapes awaiting your creation. Play just one sound or layer multiple ones -- all with individual volume selectors. This was the first app of its kind that I ever downloaded, and despite others I've downloaded since, the exclusive sounds belonging to this app are great to return to again and again.
App Store Link: Ambiance ($2.99 + optional in-app purchases)
Though this app appears to be overly simplistic when loaded, its unique feature is made apparent when used in a dark room -- like when you're going to sleep, for instance. When you open the app, it plays the sound of a thunderstorm, along with displaying blue color hues on your screen that intensify as the sound of the storm intensifies. The effect it creates, when laying your iPad down flat, is similar to real lightning that brightens up your room when it strikes. Lay your iPad flat on its back, turn the app on, and get to relaxing!