I've just been reading about this on Doug Franklin's site. Here's the blurb...

This free lesson will help you effectively teach students about the significance of sacrifice in the Christian faith. In the days and weeks leading up to Easter, it is common for us to focus on Christ's ultimate sacrifice, yet it is also an important time to examine our own hearts, to see if we are truly leading a life of significant sacrifice, one that brings honor to Christ. We hope this lesson helps you in this process.

It's not a Catholic resource, so be certain to check it through before using it. You can download it here.