I made this little wrist rest for when I use my mouse using this pattern. Rather than use cardboard and poly-fil stuffing, I grabbed some scrab fabric I had and sewed a little pillow about the same shape and size as the knitted pillow. I filled the sewn pillow up with organic flax seeds and closed it up, then inserted it into the knit pillow and stitched that up.
Oh, and I used Lily Sugar 'n Cream yarn in a variegated white/pink.. it's thicker than sport-weight yarn, but the finished product still turned out a perfect size for my wrist.
edit: thanks to those that pointed out my twisted knit stitches! i watched a video online and found that i was actually wrapping the yarn over the needle the opposite direction. i've got that fixed now for future projects! :)