Windows 8 has already been released as developer preview by Microsoft. But it will take long before Windows 7 starts losing its charm. Windows 7 has lots of options for OS customization and enhancement of its visual appeal. A lot of cool Windows 7 themes are available for free. If you are looking for a creative and totally unique theme, you would be interested in the Illusions theme created by Josh Sommers.
Josh is a digital artist and his channel on Flickr shows how rich and original his works are. He has taken his arts to a whole new level. His works of art are darkly humorous and spectacular. His illusions theme for Windows 7 also reflect his surreal art.
The illusions theme for Windows 7 comprises of pictures ranging from optical illusions like traveling through vortexes, trapped between uncanny dimensions, characters transmuted into tree or animal etc, character emerging through pictures and shaking hands with their real self and more.