Kid Quilt Kit - Pillow Top

My niece expressed great interest in quilting so for her birthday I am making her a quilt kit. She's 9, has a kid sewing machine, and has made a purse or something like that. I originally thought of making up a star pattern from AmandaJean's tutorial but triangles can be difficult. I don't want to frustrate my niece, she'll turn 9. So I decided on a rail post pattern. So far, this project is all in my head but I've been thinking about how to provide instructions and if I should create the project and photograph the steps (ala AmandaJean). I think I should. The next steps are to find fabric from my stash that I can use for both the gift kit and the how to portion. I am hoping that fat quarters will work nicely. Has anyone ever made up a kit for a young person? Any tips to pass along?