Tile ideas - and maybe an idea of a price?

[Alberta Stone]

Depends on your proximity. But it is the same as an electric blanket.
Just cause you can't see it doesn't mean it won't have an effect.
Take a good gauss meter around various electrical things commonly around you and see what kind of field they emit.
Try one around your cell phone and see it go off the chart.

 

[White Room]

Give it 30 years and maybe the health warnings will come to light but something will do the aspestos thing