Chrissie,
I love your quilt and the lay out. The embroidery is an extra special touch! My grandson is four, I gave it to him on his third birthday. If I were you I'd keep that one just as it is and have your grandson "help" you pick out the next one. I think the second one I made Landon was a "monster truck" rag quilt. He's quite the daredevil! I don't have a pic of that yet, but will get it soon to show you. You can do one of those fast. If in a hurry a small one can be done in a day and a large one in two.