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.
Barbed wire and crystal. rusty and sharp with elegant and sparkly. my kind of contrast (How hard would this actually be? Have plenty of barbed wire in the barn. Paint it, or leave it rusty?) What a wedding piece!