Have a large glass bowl set up before the kids enter or on the alter before church for Youth Reflection. Put 4 small bottles of red food coloring in bowl. You cant see it if you are in the congregation. Have a pitcher of water and an empty glass. Talk about how our cup overflows with blessing and start pouring the water in the glass as you hold it over the bowl. When the water overflows out of the glass and into the bowl it turns red. End by saying our blessing of all blessing is when Jesus shed His blood for us and our sins so we could have everlasting life.
I didn’t practice this and when I did this during Youth Reflection in the service, I cried. It really overwhelmed me and all those in the church. The adults cried and the kids eyes were as big a saucers.