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.
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DIY: Wired Tea Light Holder : from Remodelista - Simply twist coated wire (jewelry supplies any craft store or maybe wire hangers?) using pliers around a tea light. Be sure to use tea lights with a base to prevent wax drips and fire hazards.
This is in Swedish but the pictures show you the basic idea. They used moss and really pretty white candles in what looks kind of like a bird cage. I translated to English but it wasn't completely clear.