This is basically a modification of the liQuid theme to make the titlebar look more like Mac OS X. Although OS X doesn't have window borders, I found them necessary in icewm, so I made some from scratch.
IceWM is a stacking window manager for the X Window System graphical infrastructure, written by Marko Maček. It was written from scratch in C++ and is released under the terms of the GNU Lesser General Public License. Wikipedia