DIY Yarn Wrapped Jam Jars - it's a good idea for the tunnel just to light the way. A solid row of these along the sides of the tunnel would be a good alternative to using whatever lights are built into it.
This is a DIY tutorial on how to make Macrame Plant Hangers. It’s a fun craft that requires few supplies and is suitable to large groups. There’s lots of room for creative differences and twists once you get the basics down.