In Morah Akilov’s UPK class in Yeshiva Sha’arei Zion, the children learned that, in Parshat Lech-L’cha, Hashem promised Avraham that he will have as many children as the stars and the sand. The children worked on their fine motor skills by coloring, cutting, and applying sand to their artwork. They learned that Hashem asked Avraham to leave his father’s house, his birthplace, and Hashem didn’t tell Avraham where to go.
From here we learn that we must have emunah in Hashem. So, too, the children made footprints to resemble the footprints of Avraham and his family in the sand.