Use clear plastic plates to make a "snow globe" winter scene. The teacher had kids write about "if I were in a snow globe." but I think I'd do a writing exercise more like "What I like about winter." or "What I would do in the snow.
Twigs/branches from home with paper flowers/leaves! Simple window display idea to create and adjust the branches to suit the size of your window. You could even use this in your glass cabinets & jewellery displays to create an all over look!
physical and visual representations of habitats. Creating this kind of rainforest diorama would take a lot of investigation and trial and error to make it work. I think this would require critical thinking and many cross-content skills to construct.