Red, yellow & green buttons

[shankara7]

I thought Lion didn't come with the colored buttons in the top left corner of the window, mines are colorless. Then yesterday my wife was logged in under her user and noticed the colors in the top corner.
How do I get mine turned on?
Thanks for your help.

 

[shankara7]

?

 

[Mac-Michael]

System Preferences -> General -> Appearance: Blue

 

[shankara7]

Thanks Mac