I saw mini lightning balls (about 3-4inch diameter) in AusPost recently, only $5 each, i think they plug into USB to power them, designed to sit on your PC etc...but a great prop/mod for a pin too ;-)
I think they also in certain $2 shops/giftshops too....

I still own a real "eye of the storm" from the late 80's, approx 8inch diameter sphere. ;-)


The mini spheres of today can be easily modded & included into a pin so the lightning effect is only triggered during a certain target etc etc..