Noizio - Feeling that the noise of the big city is too much for you to bear?
Tiny Instruments - Let tiny instruments brighten up your day!
Noisli - Noisli is a fantastic background noise and color generator for working and relaxing. Online soothing ambient sounds like White noise, Rain and Coffee Shop.
Defonic - Create a unique sound environment at home or in the office
CSS Galore - Rich collection of css generators with live preview.
Noizer - Ambient sounds like Noisli, but free