As a follow-up exercise, we made our own large "pair" of feet. We decided that synonyms belonged on one foot and antonyms belonged on the other. The students traced their own feet to make a pair and then wrote their pair of either synonyms or antonyms onto their own feet. In the end, we had a giant pair of feet featuring pairs of synonyms and antonyms.
Naturally, I did not come up with this idea. I am very grateful to Ms. M's Blog for sharing her students' work. Click on the link to view her original idea.