I have heard this technique called a couple of things - plus sign or corner stamping seem to be the prominent names. Very often, particularly when I am doing classes, I don't have enough designer series paper in one specific color or design. This type stamping helps with that need since you are designing your own.
Cut 1/2 inch on both the long side and short side of the white cardstock so that your starting piece is 8" x 10 1/2" Either score or lightly pencil mark at the 4" on short edge and 5 1/4" on the long edge. I like the score line a little better as I am a little heavy handed with the pencil.
Start stamping your design in the center and moving circular so that your design is in all four corners. There is no right or wrong way to do this. You are simply building a design and pattern.
Continue moving out from the center and up the score (or pencil) line in all directions.Make sure you leave white space for your sentiment.
Warning! I do suggest that you use one stamp and one ink pad at a time. This comes from my accidentally double dipping my stamp that had been inked with Evening Evergreen directly into my Pale Papaya ink pad. It was a bit of a mess to clean up!
When you have created the design you want cut on the score lines (or pencil marks). If you want to add some additional stamping, now is the time to do it.
Add your sentiments as desired and attach to card base. This is a fast and easy way to design four cards at one time. I hope you enjoy this project.