With the help of an amazing plugin, you can take simple shapes and add greebles, little (or not so little) bumps to make a boring shape much more interesting.
Here's a great model to get you thinking about a beach vacation: a beach ball created with a few simple tools.
Cube and Hexagon
You might not think there's a relationship between a cube and a hexagon, but so many objects in 2D and 3D geometry are related in interesting ways. This project shows you how to use the Section Plane tool to find a hexagon inside a cube.
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Anyone can design anything in 3D! http://www.3dvinci.net/