> I provided here two examples of what could be base pictures for a default background:

Alex,
would you be interested in providing a series of images as possible backgrounds?
We can choose one to be the default and can add the others to the list of available ones.
Images of natures or outdoors or whatever else are welcome.

IMO a lot of the backgrounds currently available are from a "prehistoric age" and we should consider updating the list removing some old "pale ones" and add some modern ones.

Cheers
  Michele