Kudos to fozzy for pointing out an interview with Bungie's Shikai Wang, the artist on the Halo team responsible for much of the Covenant races and technology we will be seeing. Graciously transcribed to the forum for your reading pleasure, the article comes with a scanned image courtesy of Mark Levin depicting:
[Shikai's] computer, which has some purplish blob with holes on it (presumably something for the Cov's). However, on the desk, along with some pills, a huge ammount of CD's, some sort of canned food and some crest (????), is a concept sketch of a vehicle. There's also a second photo with a different vehicle sketch that Shikai is working on. While these are rather small, they are legible, and it's really to bad I don't have access to a scanner.
Fortunately, the scanning part has been taken care of (if you have any difficulty viewing the image, wait and try again). Definitely an interesting read, on paper or WebBBS.