Replacing icons help

[Trance]

I'm getting my first mac in July, I found some cool replacement Icons I would like to use for Safari,Mail and VLC what format should the image file of the replacement icon be? I see .PNG and .ICNS

 

[tug]

hi, all you need is this;

http://www.panic.com/candybar/

you need to d/l "ico" files. here is my set;

http://www.iconarchive.com/show/mac-icons-by-artua.html

what do ya think? cool eh!