Drop cloths from the hardware or home improvement center are dirt cheap. You can embellish them, paint them, the possibilities are only limited by your imagination. Use a curtain or drapery rod with curtain clip rings and you don't even have to sew if you don't want to!
If you purchase drop cloths from the home improvement center I would suggest washing and drying them first so they aren't so stiff! They would make great curtains!
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You can also buy canvas at fabric and art stores.
I used drop cloth curtains all throughout my home. I love how simple they are and they require no sewing to make! Here's my tutorial: https://www.aratariathome.com/blog/diy-drop-cloth-curtains