How can I create an image like this?
I use GIMP. Are there any plugins to do this? If not, are there any other ways to accomplish this, such as in Photoshop?
This isn't really a programming question.
Hint: Take a look at the perspective tool in The GIMP.
It looks like a simple 3d transform rotation with a drop shadow.
If you have word 2007, it's very easy. Import your picture, select "Picture Effect"->"3D Rotation"->"Perspective" and then "Picture Effect"->Shadow
Do that to the 3 images you want, drag them to where you want, and save it as a picture.