The coolest things to print on a 3D printer seem to be body parts, most often faces, but also cool are hands. However, hands seem to be a fairly complicated structure and many people simply try to find scans of 3D hands they can print.
3D Modeler Dennis Jensen shows us how to build a 3D model of a human hand in a few moments using very basic techniques that could be applied in many 3D modeling programs. He uses a very simple technique with basic shapes that are slowly twisted and bent into a highly realistic 3D hand.
If you can master this technique, you'll be able to create hands in many positions - but be sure to arrange them so that they are easily printable.