I clicked through About.com's sewing pattern section until I found one I liked. Using left over material from the other pillow cases I've sewn, I got to work.
This pattern uses half square triangle units, which I learned in my quilting class were quick to make. After cutting 5x5 squares, I pinned 2 different material squares together (right side of fabric facing each other) and drew a line down the middle.
Using that line as a guide point, I sewed a straight stitch down each side (1/4 inch out) and then cut the square in half (right down the line).
Once the units were separated and pressed, I used a 4x4 square ruler to cut off the access leaving me with 12 half square triangle units to go with my 4 corner white blocks.
Sew all of those pieces together and you're left with the front piece of the pillow case.
I used the same steps to turn it into an envelope pillowcase that you can find here. The center is a little off, but other than that I'm really lovin' this pillow!
I think it will look great with the rest of our bright pillows once we get our new dark gray sectional!