Do you or your students want to make 3D movies like Pixar's Toy Story? This two period to two-week unit is perfect for students or classrooms that want to learn about the basics of 3D animation using Blender, without the need to invest any money.  I use this unit as a two-block period (about 180 minutes total).  Some students continue making activities even after the formal lessons are complete.

This used as a unit in Intro to Programming (renamed-- Exploring Computer Science) but would fit well into a game design course as well.

Blender Unit