Go do a google image search for 'Corona Discharge' and maybe that will give you some ideas. Now, that effect is technically from an electrical field, and not a magnetic field, but why be picky? The general idea is that, when you get an electric field that is strong enough to ionize air, but not quite strong enough to cause an arc to ground, you get this sort of purple glow coming off the conductor.
I'm not 100% sure how you would paint this since the effect is usually in the air AROUND whatever is generating the electric field, not on the surface. Maybe edge-highlight the panels in a bright purple? From the wiki article on this effect: "Corona discharge usually forms at highly curved regions on electrodes, such as sharp corners, projecting points, edges of metal surfaces, or small diameter wires" I'm thinking dry-brushing wouldn't really look right, but edge highlighting might. Maybe a very light coat of a gloss purple?
Or, stick the mini on a nice, thick insulator and run about 100kV to it. That should get it glowing nicely.