Need some help with customizing

Hi everyone.

Just jailbreaked my iPod last night and I am looking to change around icons and the background etc.

I'm running 1.1.3 and have already got customize working. I've changed a few things here and there, but I can't seem to understand how to do any more than what is available.

Basically, this whole thing with sources and themes etc'. I have no idea what I'm doing.

Here are my questions:

-How can I change the stock black background to something else?
-How can I change the icons (i.e. different theme' i guess?)
-What is a good source for Themes for Customize and how can I install/use the themes?

Any help would be much appreciated.

Thank you for your time.