Bare in mind that this is still just a test shot and Adywan may decide to take another route with this, but here's what I've come up with to show a sample of what might be possible in helping with this scene http://www.youtube.com/watch?v=wseA4UHgS8Y

The AT-AT model is one I downloaded from Sci-Fi:3D just to help add a focal point to this shot, the scale of the walkers is probably out, but you get the idea, also it isn't walking, they're having a rest after a busy day of shooting rebels !