Idle actions when nothing is happening

[steb6]

At the moment, when no actions or objects are detected, the robot stays in the "Home" position, and the only thing that happens is that its face on the display changes over time.
By adding some behavior during this moments, the robot would look more "human-like".
This could be a random one of the following behavior:

• Following detected faces with the head
• Says something like "I am bored"
• Go to an idle pose like the following
  
• Look around at some locations (objects of interest?)
• A scripted movent (gif just to give an idea)