I was looking for how to make a border out of blinds for my big bathroom mirror
Janet: maybe these will help
Use Mod Podge to glue strips of the blind in place. You can either mitre the corners or block them. Start with top and bottom and then the sides. Width is up to you.
Janet, I did not find blinds made over for mirrors, but I did find similar ones for windows and I thought they might be a help. Hope this gets you started!