When I got home I googled for a 'how-to' and what do you think? The first link I found was to her sister's blog with the tutorial right there! So marvelous! She has lots of clever and nifty things on her blog - you should absolutely check it out! Olive Leaf Journal
So on to my attempt. I randomly grabbed some fabric and roughly cut a big rectangle for the back then layered the 3 slightly smaller pieces on top. I used my walking foot and stitched through all the layers in a diagonal row pattern - trying to keep them roughly even without measuring or marking. The next one I make will absolutely have more real measuring and perhaps some marking. I then used my big shears to slash through the top 3 layers between the stitching lines - being careful to NOT cut the back piece (light purple w/ flowers). After I had the cutting finished, I folded/pressed and stitched the backing as a binding.
Then I tossed it into the wash with a few times with other laundry to give it the chenille effect.
Now I need to make a few for myself.