JoomlaJet have released JoomlaJet 37. It's a darkish theme that can be lit up by utilising some brighter colours in the header position.
JoomlaJet release a new theme every week and this week it's a nice simple design, best suited for a content heavy site as the content is the main focus.
With the theme you get the Photoshop files used in creating the theme and an SQL dump. The theme is fully tableless, XHTML and CSS compliant.