Jim, you might want to try the mod in the mod guides from the guy who replaced the logo. You could put anything you wanted there. As for other mods, there arn't many available at this time. We are keeping an eye out and would love to hear about anything that you find. If anyone finds anything interesting post a mod guide.
"Fix it 'til it Breaks."

Jacob - EiC & Director of Technology
Mac Pro Quad 2.66 - 4GB RAM
160 GB SATA RAID 1 - 650 GB Storage
Quad 19" Widescreen LCDs
Accessorized to the Hilt