Sublimy is a small color scheme adapted from Sublime Text 2 default's color scheme : Monokai Dark.
As most IntelliJ themes, you can install it by simply copying it into your color themes folder generally situated :
Mac OS X
~/Library/Preferences/IntelliJIdea10/colors
(IntelliJ IDEA)~/Library/Preferences/IntelliJIdea10CE/colors
(IntelliJ IDEA Community Edition),
Windows
Documents and Settings/<user>/.IntelliJIdea10/config/colors
(IntelliJ IDEA)
** This skin has been tested on Idea 11.0.1 on Mac Os.