is it possible to make a backup image of your phone?

[brc64]

I know about things like PIMBackup, but they only do so much. I'm pretty happy with the ROM I'm using right now, but I've put a ton of work into customizing it the way I like it, and I don't even remember everything I've done. I'm interested in trying a couple of new things, but I want to be able to return to the way things are now if I decide I don't like it.

Is there any way to make a complete backup image of my phone that I can restore, including the ROM and all settings and customizations I've done to it? I don't care so much if it's a multi-gig file as long as I can store it on my PC and use it to restore my phone to its current state.