So I headed to Jo-Ann's with my coupons and found some cute patterned fabric.
I cut my fabric so the runner was about a foot wide and ran the length of my table. I wanted it to hang down about 5 inches on each side so I made my cuts accordingly. Of course, you'll want to use dimensions to fit your own table if you are going to try this for yourself.
My sewing machine decided to cooperate, which doesn't always happen. I sewed three sides together, wrong sides touching.
The last step was to use iron-on hem tape to seal the fourth side shut. I could have just run it through the sewing machine, but I didn't want the seam to show. And I didn't want to press my luck with my finicky sewing machine.