How can I set desktop defaults for new users?

Question

How can I set up desktop defaults, much like most distributions do, for every new user? (ex. default wallpaper, apps, etc)

Answer 1

When a new user and his home directory are created, the home directory is "inititalized" with the contents of /etc/skel.

So if you setup a desktop like you want it to be for new users and then copy the relevant config-files to /etc/skel, that's what the desktop will look like for new users.