those are great.
The reason infrared shots look like those is because objects reflect a completely different amounts of infrared and visible spectrum light.
For those a little more interested in this, the graph below explains it well:
So, as you can see, leaves and sand reflect a lot more infrared light than visible spectrum light. This will make things that are usually bright, like the sky, darker, while other things will look very bright. The shots I took above would show just the shadows of the trees and a blue sky if taken with a normal camera.