First of all, I love that you made your own curtains and YES linens are well-known for making great curtains! They can also be used for the outer shower curtains ... not the liner of course!

Next, I would suggest using some of that hemming tape for the torn corner... if it is simply ripped at the seam.

Lastly, I think that you have missed one very likely possiblity of "how" the curtains were torn! It could very well have been that a burglar was trying to enter your home and the curtain was torn while Edster was leaping out of nowhere to scare the thief away! So, in fact, Eddie may just have saved your life!!!