Why not put a coloring page on the last page of that Shakespeare test? Give them a chance to relax a bit and de-stress.
Silly, but could be fun. Plus, it could keep some kids busy and quiet while they wait for others to finish. I found this coloring book for free online and did what teachers do best -
Shakespeare Coloring Book
And maybe you can save one for yourself to de-stress after all of that grading.