How to set background images desktop from Linux Mint 18 to Linux Mint 17.x. In the month of June of the current year will be the release of Linux Mint 18 Sarah, based on a batch basis Ubuntu 16.04 LTS and libraries GTK 3.18.
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The developers of Linux Mint are always included in the upcoming distro Mint 18 a set of new background images desktop - Sarah, consisting of 22 colorful Wallpapers, which you can install in Linux Mint 17.x.
Installation into Linux Mint 17.x (single command):
cd /tmp; wget http://packages.linuxmint.com/pool/main/m/mint-backgrounds-sarah/mint-backgrounds-sarah_1.1_all.deb; sudo dpkg -i mint-backgrounds-sarah_1.1_all.deb
After installation, open System Settings => Backgrounds, activate the left column on the line called Sarah, select any image (as in the below picture) or in parameter Settings, turn on Slide Show: