would have been a great idea for french doors. You could use it on your new kitchen backdoor. Simple roll up curtain under a flat pelmet in linen. Perfect idea for back door. You could also use a piece of linen like a table runner or table cloth.
I tried this out to make guest slippers. It took a bit of work through trial and error. The real problem is that thick felt like that is really expensive and the thinner stuff doesn't hold a shape as well