Our school has a tradition of changing our theme every year. I just got back from our opening retreat and we decided to go with this based on 2 Timothy 1:6
"Stir into flame the gift that you have"
We also loved this quote from John Paul II
"You are the unique, irreplaceable, unrepeatable presentation of the face of God for the people of your life time."
We used to change themes every year; then, about six or seven years ago, we decided to go with one theme: "We Are Called to Be Saints: To Live the Gospel." It fits well with our name, All Saints.
I like the theme you've chosen. Lots you can do with that, and understandable by kids from K-8.
We do have a theme each year, but we choose just one word. This year our theme is Blessings. Last year it was Friendship, and the year before it was Service. We're encouraged to incorporate the theme into our lessons throughout the year.