If you're trying to install them via Winterboard, that's why they're not working. There's something up with it at the moment, and it's a universal problem (at least as far as the iP4 is concerned.) I was able to get Glass Orb Color going last night, though it doesn't yet have high-res icons (I was just desperately sick of looking at stock icons and I'd already made a ton of custom ones for when I used it on my 3GS, so I went ahead and bit), but after that, nothing else worked.
Does anyone know where the carrier logo's are?
I tried replacing them in the former spots (in the Carrier Bundle folders)
but my phone is not showing the logo's