I wanted to add to Meme's Faux no sew Class.
My instant no sew curtain trick is Sheets. I use a flat sheet and hang from these rings with clips.
Look they are ready to go, and no sew!
I have 9 foot ceilings, I used king flat sheets, for rooms with lower ceilings twin sheet work great.
Sheets are inexpensive and look great, I always get compliments on the window treatments and when I let my secret out no one believes me!