I think the NGP should have 3D customizable Avatars similiar to Xbox Live Avatars. You should be able to take a photo from the NGP and have your Avatar look just like you in 3D. And maybe there could be a Playstation Home for NGP that uses them.
I like what's in the NGP so far so, there's no rush in over loading with somethng with as much depth as a PS home game. Sounds cool but, I would wait until people get comfertable with their device to add something like that. It's really interesting though. I think SNEA could definitly make that happen.