Bloody Punch with Floating Hand (fruit punch) - we could probably do this with any drink, though red's best. It's water with a little green food dye, then you put that in a rubber glove and freeze it. Then you peel off the glove and there ya go!
How to make a lawn ghost - this is a really inexpensive and adorable idea for Halloween lawn decorations. I might have to add faces to mine, but I'm thinking of something like this for my lawn this year.
Halloween decoration DIY 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.