For keypad images and CallBarImages and stuff, add ride4.org/shai.xml
There's a pack in there called the Cheema Pack, it has a buncha that stuff in it. This source also will give access to some new InCallGlow images and a couple others if I recall. Not sure if the "Customize Add-ons" are required anymore for iPod stars and that stuff.
For the CarrierLogos to show up, I downloaded the following:
http://www.touchrepo.com/Tweaks/CustomizeFix.zip
There's a chooserViews.plist in there, make a backup of the one you have in /Applications/Customize.app/settings and replace the original with the one in this archive. I put the two dock images in the "files" folder but I'm not sure if they're needed, since changing the Dock image doesn't work (or does it somehow?) under 1.1.3 and 1.1.4.
There's another carrierFix on Skylar's site there, but the "custom" versions of Customize seem to have it in there, and it gets run automatically usually on the second run of Customize (first one generates the backup files). If it's still not working for you, you could download the carrierfix but keep in mind, there's a couple errors in it (system instead of System in some of the paths if I recall) that would need correction.
http://www.touchrepo.com/Utilities/carrierFix.sh.zip
Unzip that, fix the errors (I think a couple things listed in it are missing the .png at the end as well, check it!), upload it to the phone, run it from the phone, it may give a couple errors about existing files, that's fine, but after that Customize should allow the Carrier changes if it still didn't after the previous fix.
Hope it helps.