Location of Fullscreen Icon in Mavericks If anyone has a copy of 10.9, could you search system files for "fullscreen" or "tif" and post the location of "fullscreen-hover.tiff.."
Using Pacifist and searching for "fullscreen-hover" in an Install OS X Mavericks.app bundle, I found fullscreen-hover.tiff located at:

/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/QuickLookUI.framework/Versions/A/Resources/fullscreen-hover.tiff


Note that even thought I searched the installer bundle, nonetheless, the installed location should be the same.