I thank you all kindly for your help.
(For purposes of completion:)
Bby putting the line
deb-src http://splashy.Alioth.debian.org/debian/ unstable maininto the sources.list file, then, using synaptic, I got the package splashy. Then, I updated menu.list (GRUB) to look like this:
title Debian GNU/Linux, kernel 2.6.12-1-686 root (hd0,1) kernel /boot/vmlinuz-2.6.12-1-686 root=/dev/hdc2 ro quiet splash vga=792 initrd /boot/initrd.img-2.6.12-1-686 savedefault bootand all works. I have yet to explore other themes, though; nor have I booted down or attempted a verbose boot. I assume all will work nicely.
--
—A watched bread-crumb never boils.
—My hover-craft is full of eels.
—‽ <--You've just been Interrobanged.
—[...]and that's the he and the she of it.