Free Backgrounds (CC-by-4.0)

[PumpkinGlitters]

License: Creative Commons (CC-by-4.0)
License details: http://creativecommons.org/licenses/by/4.0/
Commercial use?: Allowed

Clouds BG

Credits:
Background/Painting: PumpkinGlitters ( pumpkinglitters,deviantart.com )
Texture (used in upper left as overlay): ssecret-stock ( ssecret-stock.deviantart.com )

download:

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Underwater BG
background credit: PumpkinGlitters ( pumpkinglitters,deviantart.com )
used my own textures

download: