On: Frequency-shaped background noise generators

[JonnieCache]

Also fun: loads of real field recordings on http://freesound.org

Use the geotag browser and listen to the wilderness of your choice! http://freesound.org/browse/geotags/

[JonnieCache → JonnieCache]

Just realised: these are all under various CC licenses, so OP you could easily integrate them into mynoise.net

[shmerl → JonnieCache]

Great find! You can make a good sleep mix from those :)