Bottle Top Snakes - even without all the other stuff as a cheap threading activity for fine motor skills this would be a great idea. I personally use pipe cleaners to thread things onto like beads, but lids would work just as well
Windspiel aus Plastikflaschen / Wind chimes made of plastic bottles
Plastic Bottles Craft Ideas for Kids Plastic Bottles or Detergent Bottles Craft Ideas for Kids This section has a lot of Plastic Bottles and Detergent Bottles crafts for preschool and kindergarten. This section includes, enjoyable craft ideas, free.