!!! If anyone can tell me how to make the Close button wider than the others I'd be really happy to hear it! :)
This goes well with the xl_dark theme. This metacity does work with other themes, but may not look as nice since it's taylored to be darker. Adjustments in the gtkrc file can be made to pass adjusted colors to this metacity so it will look nice.
Or just hack this file up to however you want it.
Props goes to Ken Vermette of the ubuntu art team for the original look of the buttons.