If you have Nestabilities, it is very likely the Scalloped Rectangles are part of your collection, they were one of the first few sets I bought, as most stamp images fit and frame nicely in a rectangle and look so elegant in this classic shape. To perfectly frame this large image, trim the stamped image on the line. Die cut two of the largest Scalloped Rectangles of the same size, here I used Pure Luxury White.
Then overlap them and adhere the first one over the top three humps of the second, lining the scallops up on both sides. The seam will not show once you place your image over it.