When winter comes it''s time to put together a great window box filled with your favorite evergreens. This is one of the easiest things you can do to really spruce up the outside of your home for the holidays. STEPS 1. Gather or purchase various greens, colored twigs and berried branches. 2. Have ribbon, pinecones, or other added elements for your box. 3. Fill box with sand or soil. Be sure it is damp. 4. Cut ends of greens and branches. ...