Flowers and wood
Hydrangeas are very versatile. Have them as a cut bouquet in water before Christmas, then take them out and hang them upside down in a cool place to dry. Use one dried stem at each place setting tied with inexpensive hessian tape.
Little handmade cut log cheese boards are easy to make if you have a log or two and know a chap with a chainsaw. They can even be taken home as a memento afterwards.