A round tufted storage ottoman footstool can serve, and can double as a place for storage too. Some larger models can also be used as a coffee table type, or even as extra seating. Tufting is the process of pulling the thread though the fabric and cushion, usually secured by something such as a knot or decorative button. Thus, tufting creates hills and valleys on the surface of the Ottoman, giving a decorative and classic look.
The size of your tufted storage ottoman is partly determined by the size of the room, and it may be better to choose one that is in scale with your other furniture. If you want it for additional occasional seating or as a coffee table, a large ottoman probably better. If it is primarily for storage and to be used as a footrest, you choose one that is more on the scale will be close to the seat.
If you have other tufted storage ottoman furniture, you might try to find a tufted round ottoman that has the same type of pattern on top and sides. Some locks are made so that the surface of the furniture is separated into shapes such as diamonds or squares. Similar patterns in all your furniture can help give the room a coordinated look.