Since it'll never actually happen, Martin Latta has gone and given the world the next best thing: unofficial LEGO Half-Life 2.
It's not the first custom LEGO we've seen around these parts, we know. But in building the Combine's colossal Strider, and nailing every detail about it, Latta does enough to stand out from the crowd.
While you're taking it all in, you should also check out the Combine Transport he built last year (as well as some Crysis stuff), also viewable from his Flickr page.
Half-Life [thire5 @ Flickr, via The Brothers Brick]