This is an annoyance with the splash screen - if you want to change it you have to overwrite the redhat-splash.png in /usr/share/gnome/pixmaps. so I modified gnome-core-splash.c and the spec file just a little bit to make it look for a more default name - and a symlink by default. the patches to gnome-core-splash.c and the spec file will be attached.
Created attachment 12562 [details] gnome core spec file patch
Created attachment 12563 [details] gnome-core-splash.c diff
Forwarded upstream, see http://bugzilla.gnome.org/show_bug.cgi?id=57151 (closing wontfix since we don't want to patch this in as a Red Hat specific change)