If they can function outside of the host, you can use them for... Anything. [Come on, Miles, use a little imagination.]

One of the other versions of me based his armor on nanotech like that. He stored the whole thing inside his body as a disassociated swarm, and then he could form the armor with Extremis commands. [It's basically the coolest thing ever and Tony wants it so bad.

He regards Miles with new intensity. If he could figure out how to make these Walrider nanites compatible with Extremis...]