The Red Hat fedora graphic for the main menu is located in
/usr/share/pixmaps/redhat-main-menu.png. We can
replace it with the UB Penguin logo.
The default gnome desktop background is at
/usr/share/backgrounds/images/default.png.
The default gnome splash graphic is at
/usr/share/pixmaps/splash/gnome-splash.png.
The Red Hat gdm logo graphic (transparent background) is at
/usr/share/gdm/themes/Bluecurve/rh_logo-header.png.
The Red Hat grup splash screen graphic is at
/boot/grub/splash.xpm.gz
If we create items in the menus, as opposed to the panel, the
icons are in the same place in KDE.