Customize FreePBX 2.5.x

Need a Shell Script that goes and alters FreePBX HTML & PHP Pages and changes them and customize them with our own personal skin, fonts, color schema and logos. The process must be a repeated process or the script must be able to run on a fresh install and customize it with all our requirments. We use Asterisk 1.4.22 & FreePBX 2.5.1 on a Debian 5 Kernel 2.6.26 Kind Regards