GT-N7100 KitKat 4.4.2 - I want to theme simcard unlock keybord, where are png files ?

Hello all,

Phone info : GT-N7100 KitKat 4.4.2 deodexed rooted etc etc ...

I want to theme simcard unlock keybord when you start your phone and you must enter your pin code

Does someone know where are the png files for this keyboard ?

Thanks by advance