I've wiped my WiFi icons and don't know which file to restore I've been playing around with theming OS X, and in changing my menu bar icons to be white (to contrast my now-black menu bar) I've overwritten the original icons (and forgot to back them up). 

Can someone running OS 10.8.x please confirm that the file /System/Library/Private/Frameworks/CoreWLANKIT.framework is the one I need to restore?
You are correct, I've uploaded a copy of /System/Library/PrivateFrameworks/CoreWLAN.framework here:

http://depositfiles.com/files/4cg5rhv5t

You can test that file (or use your backup) if you want. As always, you might rather reinstall the system than trust a file on the internet - even if I uploaded the correct file and had no ill intentions, the file could change before you download it, so it's always safer to get a file from your backup set or the verified install media from Apple.