Or if you're not into the idea of sticking your head through a hole so you can pretend to be Jace, there was this:
Mark Tedin wasn't the only artist there. There was also Chris Rahn, Chippy, and Raymond Swanland. Read all about them here, as well as Yoshino Himori, who illustrated the Manga-style Jace and Chandra.
We could go on for days listing things, but we'll close with Massive Magic. Mark Rosewater and Richard Garfield faced off with huge cards (more information and cool pictures here), and in the course of the game, the following cards were revealed:
Hey ... those are from Mirrodin Besieged! Here's a better look at them, especially if you don't speak Japanese.
While we're on the subject, this seems like a good time to mention that Mirran Crusader is the Buy-a-Box promo card, although it comes with alternate art. Alternate art that looks like THIS!