heh, I still call every kind of screen move a “DVE” because I come from the time before AfterEffects existed, when if you wanted the picture to rotate or translate in xyz space, you used an Abekas Digital Video Effects box or similar gadget to make those moves. We actually couldn’t afford one of those, we used (still do!) a Pinnacle Alladin (last good thing they ever made, IMO). But you can do it all with AfterEffects, you just set some keyframes and move the shot around to your heart’s content. The easiest thing for a crop circle shot might be if you could get an overhead aerial view to start with, but when I did mine, I had an aerial shot from 45 degrees or so, and it still worked fine. I just keyframed in some rotation around a point along with a gradual, eased-in zoom, to make it look like a slow helocopter shot.
Now I don’t really know or work specifically with AfterEffects, so I don’t know how well the particle system for it works, ask one of the experts here. I am a little familiar with one of the better particle systems (ParticleIllusion) and I know it has some built-in grass-like effects that can likely be tweaked. I believe it will also work with AE. Trapcode has a plug-in that generates 3-d strokes, and if there is a way to generate enough little ones, say, using a cloud of dots generated in photoshop, or an expression, that could make you some swaying, corn-like stalks that could be made to move around a bit. Another thing to try would be card dance type effect from AE applied to an alpha’d layer of stalks cloned in photoshop, to create a subtle non-uniform wave move, like from wind… This is Eran Stern / Shaun Mullen territory I’m talking about now, not necessarily something a rank beginner should attempt…. but in my head, I think I can see how it could work… only if I tried it, it might take me a month or more to work it out…
In a 3-d CG environment, this would in some ways be much simpler to create, and then maybe composite into the real scene. Typically I think it would start with a “hair” generator, settings of the “hairs” tweaked to emulate the plants.
I’m thinking if you really are very new at this, keep it simple, do as much of it in photoshop as you can. Maybe break it into multiple near-identical layers, then while th eentire comp can have the fly-around move applied to it, you can independently keyframe the corn row layers in AE to create just a little waving action, enough to maybe blur the fake stalks in the front of the cut area so the effect is less noticeable. Best of luck, let us know how it works out.