Our realtor gave us one of these when we built our new house. We love it!! You can change out the address stamp for others like "Happy Birthday" and such. Three Designing Women Custom Designer Address Self-Inking Stamp.
Housewarming Gift - Grey plantable house shaped gift tags embedded with wildflower seeds, great for new neighbor gifts or for realtors to place in welcome baskets for home buyers, by Davita, $5.50 for 12 tags, www.davita.etsy.com