Cut the Corners

I saw a block called "Cut the Corners" in a calendar of quilt squares (a different one every day). The more I looked at it, the more I saw something like an opening box. I'm afraid to post the picture from the calendar because of copyright laws... But here are photos of three blocks I was inspired to make that look like the design (from box to opening box to open box).

Here are a few more I've started, using different fabrics. As you can see, the blocks are in the process of being completed.