Recycled styrofoam cups or other styrofoam
A stove top or a hot plate
One glass bowl
Put 2 or 3 inches of water into a pot and bring to a boil.
Take one of the styrofoam cups and decide where you want pressure to be applied. Put your rubber bands around the cup and it will bend according to the pressure points once set in the steam.
Take your glass bowl and add about an inch of water to it. Next place the bowl in the center of the boiling water and put the styrofoam cup into the bowl. Cover the pot and let the cup sit there for 7 or 8 minutes. Monitor the styrofoam here to ensure that it does not melt or release any smoke or fumes.
Remove the styrofoam from the bowl and take off the rubber bands.