This is what I came up with. It is 52", which is bigger than what I had planned to make, but I like it. I think quilts along this size make excellent baby quilts because they are light enough to drag around and they make an excellent play mat. The fabric I've also had for a very long time. The line is "A Day in the Country" by Joanna Figueroa and Lisa Quan Fig Tree Quilts Moda.
The ruler was really easy to use. And this turned out SO much better than what my original go without the ruler did.