I was writing in Paper/foil relays about macroscopic electrostatic relays made from paper and graphite. Metal foil is another potential material for such devices, which deflect an insulator bearing conductive contacts using the electrostatic force on a conductive plate mounted on the insulator. Metal foil can also be mirror-reflective, which means that by deflecting it in this way, you can also redirect light. Indeed, as described in Caustic business card, even submicron deflection of the foil surface can be sufficient to produce visible reflection effects nearby. You could produce such deflections fairly quickly and with fairly low voltages.