Measure your curtain rod and the length of your place mat. Divide the curtain rod length by the place-mat length, rounding up. This is the number of place mats you will need.
Put the same number of clip rings as you have place mats on your curtain rod plus one extra.
Clip the first clip ring onto the first place mat near the outside edge. Clip the next clip ring to the other corner of the first place mat and the outside corner of the next place mat, overlapping the mats by 1/2 inch to 1 1/2 inch. Continue attaching place mats until you reach the end.
Spread the place mats out evenly along the rod and adjust the placement of the clip rings until you are pleased with the effect.