Many of the drink bottle crafts I have received use only the bottom half of the bottle, here is a great idea for using the top half of the bottle.
Take a plastic pop bottle of any size and cut it off about 1- to 2-inches below the neck of the bottle, like a funnel. Save the bottom of the bottle for another project. You may decorate with a permanent marker. With the lid off, dip the other end (cut edge) of the bottle into bubble solution in a shallow pan and gently blow air through the neck of the bottle. Instant bubble blower.