Cobalt - CM9/CM10/CM11 Theme is a personalization app available for Android devices. It is developed by dustinb and is free to download and use. This theme is specifically designed for HDPI and XHDPI phones and requires root access and a custom ROM like CM9/AOKP that supports the Theme Engine.

The theme offers a primarily blue color scheme that is significantly different from the stock ICS theme. It provides a unique and stylish look to your phone's interface. To apply the theme, users need to follow the provided instructions and ensure that they have the appropriate ROM and device compatibility.

Cobalt - CM9/CM10/CM11 Theme credits MrDSL for code and assistance, including the Inverted Market/Google Now/G-Mail code. Lawsonmh15 has also contributed a handful of images to enhance the theme.

Please note that if you have recently updated to CM12 and lost this theme, there is a separate version available called Cobalt Lollipop.