I've had Slipper Grippers recommended to me as a DIY non-skid solution (sew onto your existing items), but I haven't tried it yet.

Our house is all wood floors. I have a pair of croc knock-offs that I wear during the warm months (or with thick socks), and a pair of fleece (the kind off a sheep) slippers with a leather/suede sole that I wear during the cold months. Metahacker has fleece slippers that have rubber soles for even more traction. I bought my current incarnation of these slippers at a little store in Waverly Square.