Okay first no dark colors second for your bathroom floor use a tile but make sure it has texture to it for safety theres some new 5x12 rectangle at home depot and make sure to use a top brand sealer

You can install an underfloor heating system which is a series of pipes running under the floor where hot water runs and creates a warm floor and also heats the room with radiant heat. This is actually the most effective form of heating a space and is the most comfortable. The system components can be purchased or you can have a licensed contractor install it for you. You can put just about any type of flooring over the top......tile, laminate wood,........ Regarding flooring, if it is a very wet bathroom, I would prefer tile, but if will not get a lot of moisture you can use wood or laminate flooring.

We need a lot more info

Bathroom floor tiles have their own specifications. If you go to a tile shop and ask for the same, you'll get it with all the required specs specially designed for bathrooms.