This yakuake theme is based on the Simple Dark Stripes theme by Tero Kirjavainen. The lock is taken from the Plastik theme by suslik.
I really love the Simple Dark Stripes theme, many thanks for this one, but I also love the big sticky button of the Plastik theme (great idea!). So it was obvious I had to combine both.
Further more I often have the problem with some users that they accidentally close yakuake completely because they think (or don't ;) ) the close button is for hiding the window.
So I removed the close button and am much happier with it. :)
Maybe some of you also like it and find it useful.