Lauren Winner has written an appealing little book about how Judaism can influence Christian practice. Brought up Jewish, Winner has converted to Christianity. Her conversion though, hasn't wiped her memory of her Jewish background, or prevented her from determining where Jewish practice might well inform and deepen Christian practice. Written as a first-person account, the book isn't really biography as much as personal observation. One of her observations involves the Jewish use of a Mezuzah to mark a house or room as that of an observant Jew. She parlays that into re-using a junk sign affixed to her door to indicate to all passers-by that in her house lives a Christian.
What might happen if believers took their faith from inside their homes to the trim of their homes? Might it embolden us to live lives outside that are more Christ like? Might it help us to become less afraid or self-conscious about our faith when speaking in public - assuming we could do so without being belligerent about it?
Winner has some other twists worth reading in her little tome, and it would be worth your time to check it out.