I agree completely with the 'make what you like' concept. Even if it is difficult, you'll be more inclined to finish it. Have you sewn previously or are you new to that part of the process as well? You've made pinwheels and log cabins. Good for you! If you can do those two blocks you are on your way. The log cabin teaches you the value of straight, even seams and the pinwheel teaches you not only that, but matching seams as well. Those are two of the most important features in quilting, in my opinion. And quilters cache is a great resource for seeing what might appeal to you and has some great quilt patters as well as just the blocks.