The most Jewish housewarming gift imaginable, and it stays with the home.
A mezuzah is the small case affixed to the doorpost of a Jewish home, holding a tiny scroll, the klaf, inscribed with verses from the Torah. Fixing it to the doorframe fulfills the commandment to write these words 'on the doorposts of your house,' and touching it on the way in and out is a daily small act of home and belonging.
For a new home or a wedding, it is close to the perfect gift: it marks the doorway of the life a couple or a person is starting, and it stays with the home as long as they live there. Note that the decorative case and the kosher scroll are often sold separately, a thoughtful gift includes both.
Cases range from simple to stunning, from traditional silver to bold modern design. Choose one from an artisan that matches the person's home, and you have given them a blessing they will touch every single day.
A wedding couple, a friend moving into a new place, or anyone setting up a Jewish home. The definitive housewarming and new-beginnings gift.
Judaica shops and metalworkers and ceramicists on Etsy for the case; a sofer (scribe) or Judaica shop for a kosher scroll. Include both.