Download the theme, go to settings/themes and APPLY THE SYSTEM THEME AND REBOOT. Now select my Theme & apply. You may get an error: 'Sorry, this theme is missing assets for your device's screen size'.
Ignore that and apply it anyway and REBOOT.
The lock screen and some system dialogs cannot be themed in the T-Mobile Theme Engine, therefore they will remain unchanged.
If you get an Error Message stating that the theme was "Improperly Compiled..." just apply the "system" theme, and reboot your phone. Once your device boots back up go back into the Theme Chooser and apply Cobalt Donate.
Cobalt is Primarily a Blue theme that is vastly different than stock ICS
MrDSL for Code, TONS of Help, and Teaching me to Theme
MrDSL for Inverted Market/Google Now/G-Mail Code
Lawsonmh15 for a handful of images
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