Non skid sock ideas?

Does anyone know how I can make knitting socks non-skid? The idea of making socks is cool but sliding on the floors and falling isn’t.

I’ve heard of people using Grippies although I’ve never used them myself. I think that they also come in different shapes to decorate kid’s socks.

Oh those Grippies sound like a great idea! Anyone know how well they work or long they last? How well do they wash?