Igloos are cool. What kid hasn't wanted to build an igloo? You can easily build an milk jug igloo in your classroom with some planning, lots of milk jugs and hot glue. This could be a fun winter craft for the kids when it's too cold to go out.
Trash to Fashion: 13 Chic & Crazy Upcycled Collections
Some fun ideas in here! Instead of a tree swing, how about hanging something more grown up (but equally fun)? This inverted papasan chair base serves as an innovative place to hang curtain panels - good ideas for yard sale or thrift store finds