This is a mix between two GTK2 themes found on this website (Vista Panel pixmaps merged with Fruity Aqua controls).
I just wanted to obtain an aqua-ish style with a dark panel. UbuStuTrans emerald window decoration fits well with the dark panel. And I didn't forget the customized start button !
other decorations: OSX icons + weather screenlet + kiba-dock + almond-dark-blue xmms skin