Once again, you're telling everyone a secret!
I was thinking exactly the same thing about toning the silver paper. I don't know when I will get a chance to try it, but I definately will do that sometime. That discussion we had with Sandy got me thinking about this, and I think it is feasible to do it.
However, I'm unsure about the steps, because I was thinking that you might want to remove the excess silver first in an unhardening fixer, and then go into the tone bath, and then into a wash and then hardening solution.