5/16/15 Edit: Added an STL and updated the SketchUp file to include a Blockhead scaled 50% with a full size pin and sockets.

Here's my modified version of DesignMakeTeach's great Blockhead customizable vinyl toy.

I combined the original model with one of Emmett's pins to make the head swivel. I've included a blank STL as well as an editable SketchUp file for further customization.