It depends on your level of theming - a simple change will require you to replace the apks with the themed ones while with more complex stuff you need to replace the framework files too, if you themed that in addition to the other apps.
Sent from my HTC Flyer P510e using XDA Premium HD app
Please press THANKS if you like my help,mods,patches or ROMs.
3G Remover for WiFi Flyer
FlyCs Acidic ICS ROM for HTC Flyer
HTC Flyer S-OFF
S-OFF via Revolutionary
FlyCS Acidic ROM - AOSP ICS Or
LeeDroid HC 4.3.0
Leedroid Kernel V 3.1.0
DooMLord Touch Recovery CWM 5.00.xx
I am not only a 13 year old Android developer
, I am also at Instructables