Google provided us with some impressive wallpapers.
Now you can use them locally!
Just use Python 2.7.+, no dependencies required.
$ python2 chrome-os/download-wallpapers.py
$ python2 maps/download-wallpapers.py
Wallpapers will be downloaded to relative wallpapers directories,
such as chrome-os/wallpapers and maps/wallpapers.
Be wary of download sizes: Chrome OS wallpapers are 200+ MB combined and Maps are 1.1+ GB.