If you live for the darker sexy side of apps, I got a real treat for you.
A dev on XDA by the name of Camblue release a flashable zip of the Google Play Store modified with black and blue themed interface.
This theme is testing on the Galaxy Nexus. Should work with other ICS devices as well.
Of course this is another one of those Flash at your own risk situations.
[Root Required]
[Find the original thread here]
If you’re on a Gingerbread device, you can find Rujelus22′s version of the dark blue market down below. Sadly he has not updated it yet, so you’ll still be at 3.4.7