Here are some basic plans so far (some spoilers, so if you want the theme to remain a complete mystery, I wouldn't read the following.)

A "Startup" screen.
- You know that screen you see when you're starting your computer that has the Windows logo and maybe a little animated bar? There would be a custom screen to replace that, perhaps with the Garden logo and it would say "Connecting to Garden network" or something with a little animated bar.

A Logon screen
- In Windows XP where you usually type in your password for your Windows user name. The screen will be made to fit the overall theme, and would say something along the lines of "Enter Student ID" or "Enter SeeD ID".

NOTE: If you share a computer with your family, you may not be able to install the startup or logon screens because it may be too much of a change for the other people using the computer, so make sure you get their permission first. You should also have administrator privileges and some knowledge of Windows XP.