This DIY sewing project byCraftsyon YouTube shows how to sew a pillowcase with a free pattern provided.
Pillowcases are easy to make especially if the instructions are simple and easy to follow along.
confirm to leave room for 1/2 seam allowances and the top finished edge.

Image by Craftsy via YouTube
Cut 2 of these.
Continue to watchCraftsy tutorialon YouTube for full instructions and details.
Stitch 1/8 away from the folded edge.

Turn the pillowcase to the right side and iron the crease.
Turn back the fold to the right side of the pillow and press again.
This will keep the fold in place.

Overall, its an easy sewing tutorial to follow along with the step-by-step instructions.
I love how thorough and detailed she is because it did not take long to make at all.
This would add variety without having to buy pillowcases or bedding sets.