or he can do a theme and not permanently change his icons.
get winterboard, then go to / > var > stash > themes, make a new file call it whatever you want. Make a new folder inside that folder called "Icons", then play those icons in there and name the Cydia one "Cydia.png", and the App Store one, "App Store.png". go back to ur phone and go into winterboard, select the file you made, and click the home button.