I was just on the list of new signers of the Honor Code clicking "thank you" links.
I've never done this before, but I think I might do this periodically.
It occurs to me that it could be a nice little way to show new members that we appreciate that they agree with our community principles and have joined us in our mission.
Subtley, this might also reinforce that the Honor Code matters. People notice that you've signed it and thank you for it. People will notice if you ignore it.