Hey guys, I'm making a theme for my iPhone and iPad (and will release it once ready...who knows when that'll be )

Anyways, while I'm making good icons for 3rd party apps, I find myself not finding an easy way to theme the stock apps. Does anyone know where I can get high quality (at least 300x300, preferably 500x500+) original icons for the stock apps? It would help with my theme.

Note, I'm making my theme for iOS 6, so Passbook is obviously a must.

Thanks in advance!