I haven't written a Sunday School lesson in a long while, but here is one I made recently for my youngest children. It is free for those who come to this page for personal use in homes and their personal local churches but permission is not given for publishing in any work without proper credit to the author given.
Psalm 119:105 Thy Word is a lamp unto my feet and a light unto my path.
Thy Word - God's Bible, His letter and instruction to us
is a lamp unto my feet-it reveals where you are standing in the moment, God's Word gives useful and relevant knowledge for right where we are. (It's like when our family pauses in our walks in the woods to listen for sounds, look at the sun's placement, read the terrain, look up for broken/dead trees and limbs that might come down, and look for wildlife signs. We do this as we stand still to reveal exactly where we are and to gain a warning of what we might encounter ahead so we can be prepared. We take this pause daily in God's Word to gain information to help us as we travel further in life.)
and a light unto my path. - to be on a path is showing movement, God's Word illuminates the way to go as we journey day to day and gives us wisdom to correctly use the knowledge we have gained in our daily pauses to avoid the trouble we know is there. (This is like when we use a bright light on a trail at night. We know danger is there in the things we can trip and fall over, the things that can fall on us, and in the wildlife that can harm us, so we want to be prepared and have a way to avoid trouble.)
To illustrate these concepts, we used a small light and a map to study a path and then took a walk using different flashlight strengths. We also had one person hang behind to show how a bright light can help others. The flashlight strengths illustrate the difference between slack Bible studying Christians and strong mature Christians devoted to studying God's instructions to us. Do you want to reflect a bright light for the Lord that attracts others to safety or a weak light that can barely see where it is going and is tripping it's own feet up?