Animated Icon generation software

[dagibbs]

So, I've finally got some pictures of me climbing. (Yes, I'll get around to posting them, once I've edited and cropped, and rotated them, etc.) But, I'd like to create a climbing icon using a few of them, in rotation. So, can anyone suggest software for creating an animated icon?

The software should be: useable on Windows, freeware (preferable) or shareware, and relatively easy to use to do this particular task.

Thanks.