Here is what the card looks like when it's closed. I tied it closed with a ribbon that can just slide off.
Start with a 4" X 12" piece of cardstock. On the back, mark it at 6" on each long side. As you can see from the photo, I just used my paper trimmer and a pencil.
Fold one side to that center line, and fold the other side to meet it. (Like making a paper airplane) Open it back up.
Tip: I used a bone folder on all of my folds to make sure they were crisp.
Turn the paper 180 degrees and fold in the same way. Open it back up again.
Your cardstock should now look like this. Fold each short end in to meet the corner of the center diamond. It will look like the photo below.
With the ends still folded in, turn the cardstock over, and fold the edges in to the center. The edges will line up with the top and bottom points of the diamond. Your card will now look like the photo below.
Open the card up. There are 4 triangles surrounding the center diamond. Push the triangles in so the card looks like the photo below.
For my card I decided to decorate the center diamond, the 2 end panels and the 2 triangles in between. My center diamond was just under 3" on each side, and the 2 triangles were slightly smaller than that. So I cut the chocolate chip squares at 2 3/4" and the glossy white squares at 2 1/2".
I got the color combo from the January Stampin' Success magazine. It's from the new Retro Style Watch collection in the upcoming catalog: Summer Sun, Kiwi Kiss, Pacific Point and Chocolate Chip. I inked my brayer with Summer Sun, Kiwi Kiss and Pacific Point and then brayered over the glossy cardstock until it was well inked. I get the best look using the brayer by rolling in one direction instead of back and forth. Then I stamped the grass image from Inspired by Nature in Chocolate Chip.
For the 2 side triangles, I cut both the mat and the glossy piece in half using my paper trimmer. This photo shows how I lined up the corners in the guide.