Mouse Pad For Couch/Bed/Chair etc

I found something a lot like this on amazon, but it's a bit expensive for what it is, and it breaks relatively easily, so I'm making my own. Actually pictures of the finished product will be uploaded soon, but how it works is like this: the part that you print is where your mouse goes. Its 13 by 13 inches and has little walls so that your mouse doesn't fly off. Get some kind of 13 by 13 inch cushion, and sew it into the little holes that you can see at the bottom there. I also suggest adding some kind of padding at the wrist rest. Once finished, you should have a pretty flat, textured surface for your mouse and it's adapting to the weird shapes of the couch, blankets, or cushions that you might place it on. I haven't tested it yet, but I'm still working on it. It'll only be a few more days until I have the finished product with pictures.