Could be made out of recycled fabric for the markets at night? These beautiful paper lanterns can be easily re-created with paperclips, tape, multicolored tissue paper, pens, and sequins. Check Ikea for cheap lamp bulb/cord kits .
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.