Tree idea for Reading Area, tent... Options: attach some of the branches to the ceiling /or drape thin blue cloth for sky/night sky. Add white Christmas lights to the "sky" i.e. on the hanging fabric or wall ceiling.
Hands On Crafts for Kids - Scotland (United Kingdom) crafts for Everywhere Fun Fair. This one may be too complicated for younger kids, but when I saw it, I remembered how much I loved using sugar cubes to "build" when I was a kid. Younger children might just glue a four walled house. Using sugar cubes might make it harder to cut the openings, as it would crumble, but surely I can figure something out....: