Hm. Three screens at 1280x1024... that's 3840x1024. Wow. I've never worked with something to this scale before...
Photoshop time. I figured that the Pillar of Autumn needs to sit on my center screen, since she is, after all, the single most beautiful UNSC piece of equipment that exists (Well, next to the MJOLNIR, that is). It was decided that the Halo 3 symbol would sit upon her.
Now... what to do with those side screens... why not Halo 1 and Halo 2? I put Halo 2 on the left and Halo on the right... still to bland. I put Master Chief weilding two SMGs on the left (Since that represents Halo 2 fairly well, in my opinoin), and Master Chief wielding an MA5B on the right (Well, actually, it's the MJOLNIR featured in Halo 3, and it's an MA5C, not an MA5B, but it will do).
Viola. I had my artwork.
NOTE
The picutre below was rescaled to 1920x512, which is only 25% of the original size, 3840x1024.
And yes, I realize that this was nothing more than a simple cut-and-paste project, but it looks good across three screens.

