Bradley Ramsey writes on the Tindie blog about this robotics kit from The Maker’s Box: 

Open Source Turtle Robot Kit Teaches Beginners & Creates Beautiful Art

The Open Source Turtle Robot (OSTR) was created as the basis for a two-day workshop where high school students could gain hands-on experience with engineering concepts. The finished robot even creates interesting pieces of art via pen plotting with Turtle graphics.

The project is Arduino compatible for ease of programming and powered by 4 AA batteries to make it cost effective. Stepper motors were chosen for accurate motion, and the parts were 3D printed for easy customization.