The long shower curtian could be made with two peices of fabric cut to the length plus like 5 inches. You can just hem 3 sides and the top you just hem it with enough space to fit the rod through.
The Top Curtian looks like it has a tention rod in it. You would roughly do it the same way just in a different shape.
I don't know if that helps but that's how I would do it. You can add trim and everything. you can buy it by the yard at the fabric store and you may be able to just hot glue it around the bottom.
Good luck post pictures when your done.