Custom Windows 7 Theme Pack

Hey everyone!

I recently got Windows 7 this Christmas and love it. I just have one basic question that I can't seem to solve on my own. How do you make a theme pack? I'm not talking about just one theme that doesn't change. For example (if you have windows 7) the default designs that Windows 7 comes in with have multiple background pictures in that one theme. Here is a picture to help you understand me:

http://i48.tinypic.com/2vw8bbr.png

Notice the ones inside the red box have multiple pictures/themes/backgrounds, etc.

Well I have three themes that I want to put into a pack like the above ones that way it changes at times as well. Does anyone know how to do this?

I have tried dragging them all in the same folder and that does not seem to work. Also I have tried saving them under the same name, dragging the whole folder and images themselves into the personalize box but nothing works. If you have any idea how to do this I would much appreciate it!

Click the theme you wish to edit, go to the area called Desktop Background (next to Windows Color) and you can select multiple pictures in the window it opens up, but hovering your mouse over the picture and clicking the square... thing that appears (too tired to think of names :P) :)

Thanks! :D :D :D

right click your theme and go save for sharing.