Since finding this amazing wallpaper image in early May, I've used it as such both at home and at work. "The Iron Tide" is a 30" wide work of art depecting a huge EVE Online battle. This is the work of Meritus (aka Murtaza), and he does deserve all the merit (pun intended) for this beuatiful rendition of EVE warfare.
[UPDATE 18/04/2008] Thanks to an anonymous reader who pointed out that the above links - which I removed - were dead. Here's the link to the full size image. I've also got a downloaded version, so if this link ever dies on us I can email it to you.