Infini is a theme based off the Rezlooks engine. It does use the pixmap engine to draw the menubar however. The window manager used in the screenshots is Openbox, the themes are supplied with the GTK themes. The font used for the title bars is "standard 07_57 caps", it is not GPL'd but can be downloaded with this Windows visual style: http://www.customize.org/details/46908 Simply extract the TTF from the VS' archive and put it in ~/.fonts and rebuild your font cache (to do this it is "sudo fc-cache -f -v" in many distros). However you may use your default font if you wish, just by removing line 181 from the gtkrc of theme you are using, it is totally optional. Certain apps to do not accept the menu bar's seperate font, such as Firefox, Thunderbird, and some other XUL-based applications (as they are not true GTK). You can manually set the font in these apps however by editing the userChrome.css and adding something like: #navigator-toolbox .menubar-text { font: 6pt "standard 07_57 caps" !important; } to the file.
It has 3 color schemes: herbe (green scheme), rose (pink scheme), and bleu (blue scheme), they are each shown in the screenshots.