It is possible to create almost any object you want, within TFP, by using the various tools that already exist. Imagination is almost the only limiting factor.
Different tools have different characteristics but are essentually just shapes that can be put together.
The floor is really just a great big flat box with a different texture on each side, but you can also cut it to any shape and cut holes in it also of any shape. By putting different floor cutouts together you can create many curved objects (see Chair and Pelmet in the image).
The ceiling is the same but thinner, but it can also be sloped - as can the Roof and Surfaces tool.
There also also other Shapes available (Box, Cylinder and Tube) and Members that have unlimited profiles (eg TV unit, Copper Tubes, Podium and Microphone).
Walls are only walls because of their height and width etc but they can just as easily be sized to make other objects (eg Wagon Wheel).
All these elements form a big toolbox of things to use to make other things. The image shows just a few example.
The attached PDF is a 7 page illustrated tutorial of how to create such objects and add them to your catalogue.
If there is not enough detail just ask.
Allan