I like both ways but the columns seem more modern for a child. I love the scrappy look you made but also like the two color versions shown on the link. I don't usually like modern but this one speaks to me, and your scrappy version gives the best of both worlds. But for the child I really like the columns best. I'd float columns on white and then use just a white border then multi-colored, diagonally striped binding, so it won't get too large for a child. It going to be lovely however you do it. Please post it under pictures when you finish it.