I noticed that a set were available through a site listed on apt-get.org, but only for x86. I decided to make a go at building them for PowerPC, and got some results. I haven't build the epiphany-browser package yet, but most of the other core stuff is built. I'm running them now on my Powerbook Pismo, and they're working great with the gnome-themes-extra package (which includes several SVG themes). If anyone wants to try them, add the following to your sources.list:
deb http://platinum.heliacal.net/~demon/gnome2.4-ppc/ ./ -- Derrik Pates [EMAIL PROTECTED]