OK, so I discovered the problem myself:
1. Download Xperia Z ROM
2. Look for "app" folder under "system" folder
3. If you are looking for example Browser icon, search the Browsers .apk-file and rename .apk to .zip
4. Extract the .zip file
5. Now there should be folder named "res" - open it and you will find loads of "drawable" folders
6 . Most high resolution images and icons are in drawable-xhdpi or drawable-xxhdpi folder
Originally Posted by tardolus
I've tried to find the Sony Xperia Z (ZR, etc.) default icons anywhere, but theres only few of them. I've managed to find Phone, Messages, Browser - but it's a fact that there is WAY more than only these. I even downloaded Xperia Z ROM and tried to find them from there, but it was hopeless. So, all application icons (xhdpi) and of course those colorful "ball sized" media icons.
If someone could help me with this, it would be more than awsome. THANK YOU!