The following poem titled "The Christmas Nail" could be incorporated into your Family Home Evening, YW/YM or seminary, or Relief Society lessons.
The website Gem's Cottage also has an associated craft activity you can make a nice visual for this.
It's Christmas time at our house
and we're putting up the tree.
I wish I could find some simple way
to remember Christ's gift to me.
Some little sign or symbol
to show friends stopping by,
The little babe was born one day
but He really came to die.
Some symbol of His nail-pierced hands,
the blood He shed for you and me.
What if I hung a simple nail
on my shining Christmas tree?
A crimson bow tied round the nail
as His blood flowed down so free,
To save each person from their sin
and redeem us for eternity.
I know it was His love for us
that held Him to the tree,
But when I see this simple nail
I know He died for me.
- Author Unknown