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.
Imagine a warm summer night and indirect, warm light accompanies you and your friends through he night. Perhaps there is even a small bonfire somewhere near. Check out these 23 pictures of amazingly cozy outdoor lighting ideas!