Anyway to customize default icons?

[macintoshxiii]

I am aware of pasting new custom icon to default icon but I believe there are some icons which cannot be paste over with.... such as the network icon which I tried over a couple of times but still failed. Seriously can this problem be solve? And why is it so that certain icons CANNOT be customize with?

 

[TheAnswer]

Yes...you need Candybar from Panic Software and the Iconfactory. They have tons of icon sets available too.