Wooden Magnets with Woodland Silhouettes. Something like this could be nice geoswag. If you have some limbs and a chop saw making the wood slices wouldnt be hard, and you can get craft magnets at the Dollar Store.
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.