Bring the outdoors in!
Bring the outside in by planting a deciduous forest (with real leaves!) right on your dining room table.
Press a few dozen colorful leaves between the pages of a heavy book for a week or so to preserve them.
For each tree, paint a cardboard paper towel tube to look like tree bark. Paint the inside of one end, too. Let it dry. That will become the branches.
To make them, cut it into several 1/4-inch-wide strips. Trim the ends of a few of them to make different lengths. In the other end of the tube, cut a few 1-inch-long slits.
For a base, cut a freeform, curvy shape from cardboard. Fold open the short tabs of the tubes and glue them flat to the base.
Attach preserved leaves to the tube’s branches with glue dots. Scatter extra leaves around the base.