Here is a draft of a low tech clicker I am bring to the Summer Institute on Undergraduate STEM Education the week of July 7th.

When assembled, the students will have a cube that allows them  to chose from 6 possible answers.  The instructor in the room can easily see where the students are at by quickly scanning the colors being displayed.  It is also possible to show student confidence by encouraging them to hold them high if they are very confident and lower if less so.