No mantel? Display Christmas cards on a large board instead.
Toronto designer Anne Hepfer keeps hers up all year for the kids to enjoy: "All of the holiday cards we receive go up on a giant bulletin board in our playroom and they stay up all year long. The kids love looking at photos of their friends and relatives — a lot of whom are in the U.S. and abroad."
For more ideas, see our Designers' Holiday Decorating Tips photo gallery.