Question about "framework-res.apk"

What would be the best way to learn what every image does? I've changed mainly the notification bar pictures..haven't really done much more.

Any help would be appreciated..

I highly doubt theres a chart or anything like that..easiest thing to do would probably be just scroll through the images and see where you've seen that image before....the image name also kinda tells you what it has to do with.

Somebody should make an Periodic Table of Elements for the Android framework-res.apk .png's