Make a festive feature of your Christmas place settings. Try wrapping napkins with twine rather than a napkin ring and finish with cinnamon sticks, sprigs or holly/rosemary or twigs spray painted gold or silver.
Hanging lights on branches. Go natural with a fat branch and hang a combination of ornaments and candles attached with wire. Use twine or strong fishing wire to suspend the branch from above. You might want to try hangers so as not to damage your ceiling.