I would continue as you're doing and then sandwich and quilt the fabric and then cut the lengths for my pillow cases. You can include a thin batting if you like. You'll still have a raw edge inside the pillow case but you would have that even if you made them from whole cloth. Or you could flat fell the seams inside, to make them really neat. I like quilted pillow cases, think the extra fabric gives the pillows more shape and definition and look great as pillow shams. More work, yes, but you've already stepped in blood...... so to speak.