Change your desktop wallpaper to reddit's /r/wallpapers subreddit's top wallpaper.
If you're on windows, before running this execute:
C:\Python27\Scripts\pip.exe install ctypes bs4 PIL
For linux:
sudo pip install bs4 PIL

run reddit.py

By default, if the link to the top wallpaper is of an imgur album, First photo of the album will be downloaded.
To change this to a random photo from the album, change the value inside random_wallpaper.txt from 0 to 1.

If you want to download an entire Imgur album, run: imgur_album.py
It will download all the photos in the current directory album with a random number as name.