I didn't exactly understand what you meant by "icon list" or generally what you are asking, but i guess you mean that you have several Finder windows open, and you want to easily see all of them. You have a few ways of accomplishing this task:

1. You can use Mission Control, either by using the swipe gesture (three-finger swipe up on a trackpad or two-finger swipe up on the magic mouse) or by pressing F3. This will neatly organize all the current windows open in your space (aka desktop or full-screen application).
2. You can use the more specific App Exposè, which shows you all of the current windows for a specific app. So focus on just one of the Finder windows, and go into the App Exposè by either using the swipe gesture if you have it enabled (which is the same as the Mission Control gesture, just down instead of up), or by (I think) pressing FunctionF10.
3. Lastly, you can see a list of all the open windows on a specific app (on your case Finder) by right-clicking (or Control-clicking) it's dock icon.

If you find yourself having a lot of folders open a lot of times, I REALLY recommend that you tabs instead. You can always open a new finder tab by pressing command+tab and you can press command+option+tab to toggle the tab bar.