Today my favorite product/tool is the Fiskars Corner Rounder. This is the perfect tool to create even, rounded corners on every piece of paper. The tool is super each to use and you don't have to squeeze insanely hard to make it work. If the paper is thin, you can even cut a couple corners at once. I've had mine for almost a year now, and it still works like it did the day I bought it. I would highly recommend this if you want a little variety to your corners. It's a lot easier than trying to freehand cut corners.