Galaxy S3: How to install custom themes? (Rooted)

[Michael Wong]

I want to install a custom theme in particular, the blood red theme by team carbon. There is a video of a guy using it: Samsung Galaxy S3 Running CM10 with Blood Red Theme - YouTube
If I want to install another theme, how do I do it? Do I install an app? Or even a zip file?

 

[Michael Wong]

Please help I want to get a new theme, not just this plain old cyanogenmod one.