Is there any way to incorporate different icons, drivers etc. in firmware?

I'm not a noob (well, I think I'm not), I flash and customize phones for a long time, but I always wondered if there is any way to put icons, drivers, elfs, patches etc. in firmware so when I flash phone with that firmware I immediately get different icons and drivers without need to upload them after with some programe http://www.topsony.com/forum/images/icons/icon5.gif

Sorry if someone asked the same question.

I think you can do it if you patch the firmware before you flash it...I did this with a K750 MAIN

Install different drivers, icons, elfs, etc is impossible. But there is a program to apply patches in MAIN... but I don't remember the name.

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They talk about patches too