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.
I love these ideas for repurposing wooden hangers. While they are probably best as hangers these ideas to give them another useful life are great. ReFab Diaries: Repurpose: Hang on to your Wood Hangers!