Regardless of the type of tiny house toilet you have at home, today you will find an endless number of furniture or shelves that will adapt to your structure and in which you can take advantage of to store objects and bathroom accessories. To start taking advantage of the space you have on the toilet you can place the shelves of the bathroom on top of it.
If your tiny house toilet is of the old ones that have the suspended tanks, you can try to place a piece of furniture that adapts to its width and take advantage of its holes to store towels or other things. A very original and not very well-known idea to give more space to a small bathroom is to take advantage of the space that is in the highest part of the room.
If your bathroom is small but high ceiling you will not have any problem. If that is not the case, try simply to place a shelf over the door of tiny house toilet. In this way you will occupy less space in the lower part and you will give greater visual amplitude to the bathroom when placing it on top of the door and not in front of it.