It may have been a post of mine from a few years back that was a door hanger/wall hanger. I don't digitize so I had to search for a mug rug that already had a satin stitch border to buy. I just edited it so that I had just the frame and set it to the size I needed. If you don't have software, you can purchase a design like you want onlne and just don't stitch out what is inside the frame. Please PM me if you want more info.
I am pretty sure that this is a design that is no longer available. If you have a program that lets you remove stitches or colors, you may be able to create your own blank from another one. On this websites it is mostly designs