I created also a ambience:
Retro-Ambience
The licence is CC BY 2.0

Credits to
*Tim G. Photography http://www.flickr.com/photos/93095839@N08/
* https://freesound.org/
*acclivity, cydon, joedeshon, wavecutter, hykenfreak,inequation

I did not like, that the sound were not editable. Therefore, i put all sounds into /usr/share/sounds/jolla-ringtones/stereo. I should maybe create a new version with mp3 sounds. I will wait for the big update, maybe something changes about the ambiences .