First, I'd like to share that I've updated the recommended links page with some links to LEGO related websites, from people contributions (by far the best part) to scans of set building structions or the biggest wiki about our beloved building blocks.
And second, in the official forums of Eternal Crusade* there's a thread of choosing the favourite piece of Warhammer 40,000 art. At the time of this writing it is 35 pages long and there are dozens of high resolution artworks from most of the races.
Definetly recommended having a look at it, I found some new images I still didn't had on my "digital collection".
* In case you don't know what I'm talking about, check the Dark Millennium Codex website for all available info about EC MMO.