I would like to know how I can modify a Linux skel folder to configure
Gnome to point to $HOME/.photos/desktop.jpg

At default, it points to /usr/share/backgrounds/images/default.png

When a new user account is created by using the skel, the default
location would become /home/(usernamehere)/.photos/desktop.jpg

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Purpose:

I have installed a collection of photos in a folder on the LTSP
server. Each user account has a script which will automatically make a
symbolic link to a picture in the collection. The script chooses a
random photo and creates a symbolic link called desktop.jpg. I have
got this to work, but need a way to edit the skel folder to change the
background path for each user.

In short: Everytime a user logs into Gnome, they get a new random background! :-)

Thanks!