The actual verse for Sunday is 1 Chronicles 29:13...just verse 13. However, I needed a little more to work with, so y'all get THREE VERSES! This is a good passage to memorize. It's just a portion of a thansgiving prayer written by King David for all the gifts given to build the future temple.
Ask your students, "What are you thankful for? Where does everything come from? Other than with our words, how can we give thanks to God?"
On that last one, I would suggest that you talk about how our actions are also a prayer of thanksgiving. If I am truly thankful, I will give!