Upcycle plastic containers (spray / detergent bottles) into baskets, gift bags, containers, etc. Maybe larger square gallon jugs for holding craft supplies or keeping small things together in the closet, or.
Fairy Houses from plastic containers - cover with moss, pebbles, etc. and put them in the garden!I've been looking for something to do with all of the plastic bottles I've been saving! Yay for fairy houses!