Because I didn't give a specific prompt I couldn't really design an assessment rubric for the lesson, but the work could be graded on safe use of tools and creativity with materials. It also proved to be quite a challenge for some students' fine motor skills.
Here's a selection of what they came up with.
One example was this crazy haired, toothy portrait.
Someone else created a more abstract portrait in semi-profile.
Then there was a stick figure with an impressive side parting.
There were also a couple of really interesting minimalist animal forms.
And a really cool flower!