He guides Tony over to touch some paper lanterns he made really fast with various designed papers, string and tape. Some of them are round, like baubles, and some of them are just curved, like a design in the shape of a Christmas light. He'll keep them around until after they're healed so Tony can see them with his eyes later.

There aren't any real lights on this tree. The closest thing they have is Tony's chest, and Steve smiles a little at the image of trying to get Tony to sit on top and be the star.