So I used packing tape to fix the tear from behind and then glued some old and free rick-rack using Tacky glue.
You can see that I just ran a line of glue across the front of the shade and stuck the rick-rack to it. I then trimmed off the ends.
I had to pull the shades out so that the rick-rack wouldn't slide off while the glue was still wet. Once they were completely dried I was all done. Easy-peasey!