Anyone have any suggestions for a non-slip bath mat? DC has taken to standing in the tub, much to my dismay, and is anything but steady on her feet, especially on that slippery surface. DH and I also use this shower so I'd like something I could just lay down and then pull out of the tub as soon as she's done. Otherwise the only way to prevent the falls is for me to get IN the tub, and, I must admit, it's getting a bit crowded in there now. :) Help!