You should also prepare some headband and wristbands for the the children to wear as part of the lesson. In a larger group, use several "volunteers", putting on their "phylactries" as you introduce the lesson.
Christian plaques or T-shirts or bedroom door "mezuzah" might be appropriate crafts to go along with the lesson as well.
All these are customs which we do. Many of our holidays were originally "Holy days", now we just do them for fun or to make a day special. Most people don't remember why they do the silly things they do on holidays.
In other lands, people do other silly things. The Chinese shoot firecrackers on New Year's day. The Japanese fly kites on Boy's day.
We read this in the Bible: [Read Deuteronomy 6:1-9, 25 aloud slowly to the Children]
They must have looked silly. Why did God want them to do such a silly thing as wearing God's Word in little boxes tied to headbands and bracelets?
[Give the children opportunity to make suggestions. ]
[As you are telling the children about these, you may want to give examples from verses written on your own or the children's headbands and bracelets. Use verses with application to children's needs and concerns.]
And as they went out or came in their doors and gates, they were reminded that everywhere we are, we are to honor God.
But there is a better place to put God's word than on a headband or bracelet. The best place is to write it on our hearts.
[You may want to illustrate this by acting out someone who can't remember why a string is on his finger, etc.]
He wanted them to think about the Words of the Bible when they got up in the morning and when they were eating and when they were going to sleep. In other words, all the time. He wanted them to think about the Bible when they were going places, and when they came home. He wanted them to read and teach the Bible to their children.
God has given His Word to you for you to use. God wants us to think about His words all the time. He wants us to know how important His words are. They tell us what He is like and how we are to serve and obey Him.
Thus we learn the Purpose of the Bible God has given to us (vs. 2): It helps us to fear God as long as we live [explain what "fear" means - "to respect, worship, obey, honor", just as we "fear" parents, teachers, policemen, etc.]...and to enjoy a long life. (The best way to live and be happy is to live the way God has shown to us in His Word.)
God's Book tells us that we are to love Him more than anything else. It tells us about Jesus, His Son, who died for our sins. He wants us to know it so well His words are written on our hearts.
Some Jewish boys and girls still keep this custom of wearing God's words. And we can keep it too. Not by actually wearing verses, (though we could on Tee Shirts), but by reading and thinking about the Bible every day.
This page is: http://www.eldrbarry.net/vbs/1/wordstr1.htm