I'll explain it - it's very easy. If you look at the three main images in the set (the two flowers and the scrolly design) from the back, it will be obvious that they are shaped like a hexagon - a shape with six equal sides. So you tile them. Here's is a link to a card I did it on. It's on the upper green section of the BG. Not so easy to see behind the other stuff but if you look closely you'll see it:
Heartfelt by Rachelrose - Cards and Paper Crafts at Splitcoaststampers
or look at some hexagon tiles:
SomerTile 11x12-in Victorian Hex 1-in White Porcelain Mosaic Tile (Pack of 10) | Overstock.com
You simply use a stamp positioner to position your stamps in that staggered pattern. Because they are hexagons, it will work nicely!
Hope that helps!