All you have to do is upload a picture of your desktop in JPEG format, upload it to Imageshack.us and show it here, the photo should be resized automatically.
To post a screenshot:
MacOS / X Command + Shift + 3
Windows users PrtScn just above your Insert key
Linux users do it the same way as Windows.

My desktop is unique, because:
- it has no icons, meaning it looks neat and different and easy to use for me.
- the photo goes well with the transparent theme of Windows Vista.