The simplest solution is to switch to another virtual console, since the bootsplash image is visible only on tty1. Another option is to set the vga= parameter to normal
in /boot/grub/menu.lst. Any other vga=0x value sets the console resolution and applies the bootsplash image accordingly. Images are stored in /etc/bootsplash/themes/openSUSE/images and the related config files in /etc/bootsplash/themes/openSUSE/config. You can also change/add them to customize the background image. Finally note that in the upper left corner of the first console there is the geko logo, which is provided in two different sizes as /etc/bootsplash/themes/openSUSE/images/logo.mng and /etc/bootsplash/themes/openSUSE/images/logov.mng.
If you want to remove the background temporarily
, as root you can issue
echo 0 > /proc/splash
More about the bootsplash stuff in the documentation installed along with the bootsplash package, in /usr/share/doc/packages/bootsplash. Hope this helps.