There are some wonderful things you could do if you had millions or electron volts lying around and Bert Hickman at Stoneridge Engineering has done some.
I just bought this beautiful piece of scientific art from "Teslamania", his website. It is called a "Lichtenberg Figure" and was made by charging up a piece of lucite with a high-power electron beam and discharging it suddenly by whacking a grounding nail into the side. The effect is dendritic, fractal and simply beautiful.
I also have a quarter that they shrunk to the size of a dime in a violent explosion done with an energized coil. The coil explodes at the same time the coin shrinks.
Bert's work is truly a flash of lightning.