I'm very sorry if this is a stupid question, but I am very careful with my machine. I've had my Mac for years and I just recently decided to mice things up and install iOS 7 style icons form .icns files. I replaced apps like: Safari, Activity Monitor, Microsoft Word. ect. I know how to change them back later, but I was curious, will changing the default icon for Office or default apps like Safari cause any bugs or corrupt .plist later? Also, if I change the Calendar app and edit the package contents for a new live updating icon, could this cause corruption? Thanks!