My local Quilt Guild recently had a program on Last Minute Gifts. I am a big fan of giving pillowcases, so I thought that I'd do a tutorial on how I make mine.

I use French Seams so that all edges are finished.

I use three fabrics, cut as follows:
Pillow body - Floral - cut 27" x width of fabric
Pillow Cuff - Stripe - cut 9" x width of fabric
Accent strip - Blue Graphic - Cut 2" x width of fabric, press in half, wrong sides together.
Trim all pieces to 40" wide. Pin the accent strip and the cuff piece to the floral body, right sides together, along a 40" side.

Fold the body of the pillowcase back and forth, so that the cuff fabric may wrap around this 'roll', as shown above. Align the other 40" side of the cuff with the pinned edge, and carefully pin this layer in as well. Using a walking foot, seam together with a 1/4" seam.

Pull the pillow body 'roll' out of the seamed cuff. Press the seam in the cuff from the front and the back to get a crisp cuff.

Now, pin the pillowcase together along the open side and bottom, with the wrong sides together. I fold a tiny corner down along the top edge to help keep the seam clean when finished, see the last photo. Sew a scant 1/4" seam. When you get the the lower corner, sew off the edge. Beginning off the edge, sew across the bottom. This will serve as a folding guide when you turn the pillowcase. Fold seam allowance along both stitching lines and turn the corner wrong side out, using the stitching line on the other corner, do the same thing. This will aide in getting crisp corners on the bottom of your pillowcase when done, see bottom photo. Now with the pillowcase inside out, carefully press the seams as crisp as possible. Take it back to the machine and sew a generous 1/4" seam along the side and bottom of the case, simply turning at the corner. Turn right side out, and your done!
I hope that you enjoy, please let me know if you have any questions!