1) Before, Ron hated winter. His hands were always cold, until Harry placed Ron's palms over his mouth and breathed heavily.
Now, Ron thoroughly enjoys winter.
2) Harry and Ron share a secret language. The smallest gestures have even greater meanings.
It took years to develop; they loved every second of it.
3) Harry walked towards the Dark Lord, the ghosts around him, a comfort but not enough. He wished Ron was here, but was grateful he wasn't.