XDA Developers user Kennethpenn dumped the Motorola Atrix 4G system files on the internet allowing anyone to download the complete system dump, ringtones, wallpapers, boot animation, and build prop.
If you have any desire to check some of these out for yourself and put them on your own device check out the original XDA-Developers post which will be updated with new links in case any of the links become broken.
Any wallpaper or ringtone you really enjoy?