Yet more good (free) stuff from Autodesk, who have released a 3D sculpting and painting app for the iPad called 123D Sculpt.
Users can select from a number of pre-defined shapes as a starting point and use a variety of tools are available that enable the user to 'tweak' the model into the shape that they require.
Currently available as a free download (for a limited time) from the App Store
More details about the App can be found at
and there is a video channel on YouTube at