Writing stimulus - what's through the key hole? Make a link with stories, fantasy settings etc. Nice photo for a piece of extended writing, possibly even based on 'The Secret Garden' as I used as a stimulus last year with Year 1.
Tree that I made in my classroom. It's bulletin board paper all scrunched up. It's stuffed to make it 3-D. We call it the peaceful tree. Children are encouraged to sit by the tree when they are in trouble, sad, angry, tired, etc. There is a library clipboards for kids to write/draw their feelings.
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.