Using plastic to cover your windows during winter and summer will help reduce your energy bill and help keep your home draft-free.
Playhouse Project - Spray paint inexpensive plastic window boxes to add charm to the kids' playhouse - I just want a cubby house like this
Nantucket Self-Watering Plastic Window Box Planter
Mosquito screen curtains for under the porch
Bloem Terra 30 in. Terra Cotta Plastic Window Box - The Home Depot
Max Kostenko - Plastic window on Behance