If you use Mint then you will know that you can install earlier Mint backgrounds, but did you know that you can also install Tessa backgrounds?
The easy way to do this is the head here, http://packages.linuxmint.com/list.php?release=Tessa and from there download the deb. file for them and install them.
I tried this as I was wondering if it was possible to do and it works every time.
Note if you try to install earlier version backgrounds a warning will come up to tell you that they are available in software manager and to use that.