Font of the "Project" pane

How can I increase the font size of the "Project" pane?
I have changed the font size in "File/Settings/Appearance/Override default fonts" to 18, and all other menus, dialogues, and panes looks good. But the font in the "Project" pane is so tiny I can barely read it.

Any help is greatly appreciated.
Thanks in advance,
--Sergey.

P.S. My screen resolution is 1920x1200, Intellij IDEA version 7.0.3, OS Ubuntu 7.10, Desktop environment: GNOME.