For mine (left), I used one strip of about 1 1/4 yeards of heavy fabric cut 16 inches wide (2 of those inches were for seam allowances). I simply folded down where I was going to hem the edges with an iron and then sewed away.
For Jen's, she used two different fabrics to make a revisible Thanksgiving/Winter table runner. She simply sewed the fabric right-sides together along three edges, turned the fabric right-side out, and hand-sewed the fourth edge.
For Stacy's (bottom), she used two different fabrics too, but to make her runner extra long, she joined her fabric at the middle of her runner and sewed it together on the bias to make the seam less obvious.
I basically hemmed a rectangle then folded one long side over and sewed it to make a pocket for the rod to go through.
Note: For heavy fabric, you may have to adjust/increase the tension on your sewing machine.
Helpful link: Table Runner Tutorial