I printed this image x 7 on our really awesome printer and cut around it. It comes from Pixabay, which is a royalty free image database and is super awesome! I use it for a lot of things.
I used scissors and cut around the image, then put double sided tape on the back side. Next I stuck small bagged treats into 4 balloons and cotton balls into 3 more and blew them up. I taped the vampire face to the balloon and just tossed them onto the floor in one of the bedrooms.
Unfortunately I didn't get pictures of the scene but it's simple enough to picture in your head. We let them use a big diaper safety pin, with supervision of course. Older kids could be given something a little sharper. Here's a little bit of the devastation after the kids got to pop them.
This one gave our 2 year old an extra thrill, since there was the loud POP as he poked them with the pin.