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!
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.