This posting on Ask Ubuntu has a great tutorial explaining how you can transform your Ubuntu installation and make it look like Windows 7. http://askubuntu.com/questions/50581/is-there-an-ubuntu-theme-available-to-make-it-look-like-windows-7. This is a great idea. You can fool people into thinking that you are running an operating system from Redmond WA and not Linux.
Here is a Windows 8 cursor theme for the Gnome Linux desktop: http://gnome-look.org/content/show.php/Win8E?content=160758. This is very cool.
A Windows 8 Metacity theme: http://gnome-look.org/content/show.php/Windows+8+modern+UI+%28metro%29?content=157024.
Windows 7 icon theme for the MATE desktop: http://gnome-look.org/content/show.php/Win2-7+Pack?content=113264.
A Plymouth theme, this will make your boot process look just like that of Windows 7, but you will be booting Linux instead!
http://kde-look.org/content/show.php/?content=128652.
If you prefer to read howtogeek.com instead, then the same tutorial is here as well: http://www.howtogeek.com/55985/how-to-make-ubuntu-linux-look-like-windows-7/.
With the tips in these tutorials, you can transform your Ubuntu machine to resemble Windows 7.