Suzanne is the iconic mascot of the Blender 3D drawing program.
I thought I should give the program a try; it is open-source and free. Blender has built-in animation and rendering capabilities. More importantly for me, it is capable of producing organic designs which are hard to achieve in Google's SketchUp. I've had fun so far learning a bit about the user interface, and tinkering with the controls. Whether the program can be mastered by the average 70-year-old is something that remains to be seen.