Black Glass X is a very popular theme for the Droid people. If  you are techie with experience in this field, you will probably know about all this. But for the new people around here, this is a very good one for your phone. But be careful, you are not given any rights by the designer of the theme to tinker with his work. So you can just download this theme and use it. Dont try to alter it.

A few of the third party apps also get themed with this theme. So there is some kinda of uniformity maintained by the theme. You can download it for free from the DroidXForums page.