1. show item size caption below an icon in the icon view and the desktop at 100% zoom level:
a. type in a terminal: gconf-editor
b. go to: /apps/nautilus/icon_view/captions
c. change value order as you see in this screen-shot

Enjoy it!


2. where are the gnome icons and themes:
/home/manzur/.icons
/home/manzur/.themes