Friction...yes some manufacturers do offer cloth heated seats -- the current Focus has then as part of a package. Usually you find them with leather seats because it's considered a "luxury" item.
I have the leather seats, and yes they are a little chilly on the behind when I first get in, but they warm up to body temperature quick enough that I don't miss the heaters.
Turbo...that works, but then you end up with the "phantom fart" smell a few months later.