Glowing Eyes: Save finished toilet paper rolls, cut eyes into them. Put glow sticks in the toilet paper rolls. Place the rolls into your hedge, trees or bushes at night. Watch people freak out as they pass your lawn.
DIY Pet Paw Prints - Could do something like this as a remembrance when beloved pets pass on. What a cool thing to do if you get them from puppy to older. Use them as a yearly dated holiday ornament (keep their dog tags / cat tags as well)