If you always wanted to get started with 3D, Bryce would be a good start. You can make basic shapes using the simple tools that Bryce offers.
First of all, you can get Bryce 5.5 for free now, so you can start right away!
Download links:
Apple users:
http://download.cnet.com/Bryce/3000-6677_4-10907705.html?tag=mncol
Windows [...] submitted: 5 years and 1961 days ago