This is a cool project you can do with a vacuum former and a few milk bottles,
I will make an Instructable on how to make a former but for now look at others there are some great ones,
you can checkout how to make this with free plans here
Step 1: Gather your quipment
I have here a ;
Step 2: Making stuff..
Plastic from the bottle is then stapled onto a frame.
Step 3: Vacuum forming..
The frame is then pressed when hot from the heat gun and the vacuum is turned on ,the plastic gets pulled around and sucked down creating an object from the mould.