My notebooks are heavily edited from a design offered by Silhouette. (A lot of my 3D designs found their start as patterns I bought from Silhouette.) I made them large enough to accept 3x5 paper and then adjusted the flaps for my velcro closures. I started making them not long after I bought my Silhouette pens so they worked as a great way to experiment with pen designs. While they require extra planning and multiple steps to complete, I really am proud of how they look and function. This one of the Cosmos logo from Dissidia is one of my favorites.
You can see all of my notebook designs in the Notebook Gallery.