After getting extremely bored with the stock sounds on Ubuntu, I Decided to make my own,
And I am sharing them with the world under the GNU Licence in a bid that they may be included in a Distro one day.
(done using LMMS with stock sounds)
To describe them, I guess they are kind of 'Dreamy' or calm.. (and no drums!)
***How to install
Extract contents of the zip archive and place the folder new-age-ubuntu in the /usr/share/sounds directory (you will need root access to do this, and make sure they are readable to everyone (chmod 755))
To use the included usb device sounds, you need to have sox installed (sudo apt-get install sox), and the sounds need to be in the location described above. To use the usb_detect.sh script first make sure its marked as executable (chmod a+x usb_detect.sh) and to use it you can include the script in gnome's startup applications, or wherever you prefer.