The entire Default UI director is ~160megs unzipped, and ~48megs with maximum compression. Of course most of these files you don't need and/or won't use to modify.... but I'm not really up to sorting through all the files atm
*edit*
Since the xml is posted above, here's all the images files in the /images/ folder, and the sub folder, /icons/
http://www.advancedmod.com/EQII/ui/d..._UI_images.zip
~6megs zipped
~26megs unzipped