One of the good things about Linux systems is that they are very customizable. If you really want to, you can make them look like a Windows counterpart, with very little effort.
Making an Ubuntu or Linux Mint system to look like a Windows 8 is quite simple and it's easily done with the help of a PPA from noobslab.com.
You will need to open a terminal and enter the following commands (you will need root access in order for this to work): sudo add-apt-repository ppa:noobslab/themes sudo add-apt-repository ppa:noobslab/icons sudo apt-get update sudo apt-get install win-themes sudo apt-get install win-icons To activate the themes and the icons you will also need to install an application like GNOME Tweak (it's usually found in repositories under the name of gnome-tweak-tool).
Enjoy your Windows 8 look-alike operating system.