  We demonstrate a controllable enhancement in the electrostrictive properties
of a medium using dilute composite artificial materials. Analytical expressions
for the composite electrostriction are derived and used to show that
enhancement, tunability and suppression can be achieved through a careful
choice of constituent materials. Numerical examples with Ag, As$_2$S$_3$, Si
and SiO$_2$ demonstrate that even in a non-resonant regime, artificial
materials can bring more than a threefold enhancement in the electrostriction.
