For camera purposes, there are various kinds of bean bags that contain either
balls or structured 'beans' which stick to each other when vacuum is applied. It
is also possible to have a 'bean bag' made of clay or plasticine (or Blu-Tack
which is my favorite temporary glue material - I always have some Blu-Tack
somewhere during prototyping, I even 'qualified' it for microwave use (2.4GHz)
and high voltage (50kV/10mm)). The only disadvantage is weight.

For non-Newtonian liquids (using magnetic control), see this:

  http://www.youtube.com/watch?v=qX6clRC21vo&mode=related&search=

I once wasted some time looking similar things up on the web, and there are
several. There are some where the 'sculpture' is achieved by moving ceramic
magnets under (or above) a tray with ferrofluid.

For a quick shot (!) of proper corn starch solution, a Twix or Mars bar with the
top chocolate layer peeled off with a kife will yield a few grams, ready to use.

Peter P.

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