In theory the splash screen icons are themed, but the theme doesn't seem to cover them all, or theming isn't working for some reason.
OK, the red CD was using the wrong icon name, I'm fixing that. However the other icons just aren't drawn in Bluecurve: gnome-panel.png gnome-ccdesktop.png gnome-session.png gnome-ccwindowmanager.png So if we want those to match Bluecurve we need to draw them.
Okay, I have made the new icons and committed them to redhat-artwork.
Fixed in 0.69-1.