I would suggest the usage of NiTinol Wire that can be found
here Nitinol stands for NIckel TItanium Naval Ordnance Laboratory, it is a shape memory wire, that will resume its original shape if a charge is run through it. To choose the shape, all you need to do is bend the wire to the shape you want it to return to, then heat up the bent areas, or the entire thing. The only problem i could forsee, is that because of the heat that is produced by the resistance, NiTinol wire does note come with the rubber coating, therefore it is open voltage. Fairly thin pieces can be obtained in order to only require a small amount of power, but the thicker the wire is, the more power it will require. If you have any questions please email me, Good luck
