Here are my simple models (using only two objects):
Firstly a chair, extruded from a single cube, with a further cube forming the back-rest.
Secondly, two toothbrushes - the first, extremely basic, created from two cubes. The second is slightly more complex. I used Loop Cut and Slide to increase the detail and the curvature of the handle, while using a cylinder with the Array modifier for the bristles.
Finally, I modelled a car wheel using a torus for the tyre (using Edge Loops to select and flatten the shape a little) and a cylinder with several Insets and Extrusions to get the rounded shape of the hub cap.
