Hard to do this from work (since most of my computers are at home) but I did find an old screenshot compilation that's a good start.
These are the wallpapers from (top to bottom):
2400 (My computer that stopped booting because of corrupted hard drive boot files, just before finishing my MMZ run a year ago. It came back up, then went down again when a powerful storm rolled through and fried a good number of machines in our house through their CAT5 connections.) (Currently looks like it's finally booting okay, just need to investigate that weird sound it's making.)
1200 (Currently dead, most likely due to a bad power supply. Will fix eventually.)
600 (Hard disk recently became unbootable ; this machine doesn't really exist anymore.)
In the process of trying to bring 2400 back, ended up, instead, making a new computer. This is its desktop:
http://img484.imageshack.us/img484/374/screenshotfd7.png
For my Mac laptop, there are two desktops...
This is the one always shown on the laptop itself.
This is the one on my monitor here at work.