Foam toroid?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Tesla Coil list <tesla@xxxxxxxxxxxxxx>

So I'm sitting here playing with JavaTC and thinking about differnt 
top loads I could use for my first coil, and something came to mind.

Has anyone used a "styrofoam" craft ring/wreath? they're not really 
the puffed polystyrene like real styrofoam, it's that hard crumbly 
white foam.... it's sold at craft stores in various shapes... eggs, 
cones, spheres, flats, etc.... but I have seen various sizes of rings 
made of the same stuff....

So has anyone used this, wrapped in foil and Al tape? How does it 
work compared to the dryer duct?

Thanks,

-Doug