nice array of themes, but 1st 2 buttons of the window upper right trio of buttons -minimize, down/full-size, close -are thin black lines I can't see over the dark colors. It might be a Ubuntu Linux window setting but even then, changing that setting to light color would fail to show on the brighter backgrounds. I'll have to dig deeper into Ubuntu Gnome UI than I'd really wanted to... best solution would really belong there, setting window buttons' color, and per that a contrasting character background color to ensure the buttons are visible... :)