Radiant floor heating is on my ultimate wish list; in the meantime, a friend turned me on to a nifty quick fix solution: heated floor mats placed under area rugs to create zones of coziness.
My friend's studio is located in a large, drafty barn; to see her through the winter, she uses a low tech (and admittedly unglamorous) heated floor mat that plugs into the wall and is similar to an electric blanket for the floor. Cozy Winters offers Rug-Heat mats; prices run from $149 to $299, according to mat size, which range from two by three feet to five and a half by eight feet.
Above: My home office features a tiled floor that is wonderfully cool in the summer but rather cold in the winter. I'm considering adding a warming mat underneath the jute rug.