I put together this lesson on the Eucharist with a little zine for our kids at church. I tried to make the book appropriate for a broad age range. It simply explains the Eucharist, with quotes from the services, and bubbles telling the children ways they can participate in the Liturgy, with an image to color on each page.
It prints on one page. Fold the paper in half, in half again and in half again, then cut just the center vertical fold. Then you can fold it into a zine. Better fold and cutting instructions here or here. I love this easy zine template and make books for my kids frequently with it. Grab the png below to make your own. Print it at actual size (not scale to fit) for the folds to line up correctly.