Been here and it is an (relatively)easy fix.
You need an Microsd you can format
- format the Microsd to fat32
- copy for factory .nbh (Rom) file to the card and call it voguimg.nbh
- put the card in the phone and reboot, it will load this "New" rom onto the phone and you will be back to Stock.
- You can then do it all over again and NOT let the customizations run next time.
You did NOT create a paperweight.
If you do not have the factory rom .nbh file, they can be found at
http://forum.ppcgeeks.com/showthread.php?t=19071. download your factory rom .exe file and unrar it. inside wil lbe an .nbh file, use that one and just rename it.
It HAS to be the factory rom for this to work.