"broken windows" : take frosted contact paper and cut it apart to look like fractured glass. The semi-transparent frosted contact paper takes on the appearance of the "glass" while the actual glass pane (which is transparent) disappears.
halloweencrafts: DIY Soda Bottle Bell Jar Tutorial from Seeing Things here. Detailed tutorial that takes the plastic bottle bell jar/cloche to a totally different level. *For a similar tutorial using a different top go here.
Halloween Pumpkin Papier Mache Pumpkin - Use a balloon and twine to form the pumpkin sections, then add your layers of paper strips. Allow to dry overnight, then paint. Very Clever! This link also provides you with a Homemade Candy Corn recipe!