You will need a resource hacker of some kind so you can export/import the icons from the .dlls
For the Action Center flag are in the ActionCenter.dll
For the Network icon (the wireless and wired) are in pnidui.dll
For the Volume icon it is in SndVolSSO.dll
If you have a laptop the battery indicator is bitmaps instead of icons they are in batmeter.dll
You are showing you have 64-bit installed so the above .dlls will be in both C:\Windows\System32 and C:\Windows\SysWOW64
You should put copies of these .dlls on your desktop and modify them leaving the originals alone.
After you have your .dlls edited to properly change a system file you need to take ownership give yourself permission and rename the original .dlls and then copy in the new one, look at Post #6 of this thread will tell you how to do it Basic Networking Information
If you need more information or help let me know.