Togeo Studeos has released Dreamscapes 4 - a free Ableton Live pack that features one hundred plus atmospheric soundscapes, rhythmic drones, airy pads and swirling background textures.
Here's what they have to say about it:
These highly tweakable instruments for Ableton Lives simpler device can be used with almost any musical style and genre and will be a welcome addition to your sound library and music production toolkit. Perfect for film scoring, soundtracks, atmospheric or chilled out ambient and electronic mixes. Each intrument rack has an assortment of macro presets allowing you to quickly alter the sound and effects for a virtually unlimited range of tonal variation.
The Live Pack requires Ableton Live 7 or higher.