Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Although GRUB 2 replaced the older GRUB 0.9x (currently known as 'GRUB Legacy'), the latter still is the default boot loader on some distributions, like Debian 5.0 for example.
The splash screen for GRUB Legacy is an XPM image which appears as a background when you select which OS to boot. For those who are tired of the default splash screen, here is a short tutorial on how to change it.
First, download some splash screens from here (or Google some). Each splash screen comes as an XPM image archived as a Gzip file. Once you downloaded the desired splash images, copy them inside the /boot/ directory, or create symbolic links in this directory which will point to the actual location of the files. For example, if you downloaded the file tenerife.xpm.gz inside your home directory, you can type as root (and replace USER with the actual username):