Didn't find the same cornerstone fabric, but found something that will work. I searched the Internet for a couple hours after I got home from the quilt shops and figured out the fabric I used was Pepper Pistachio from Momo's Wonderland (that took awhile) and it isn't available any more. Oh well.
While looking for a cornerstone substitute, I found these adorable Halloween fabrics from Minick & Simpson. I don't normally make holiday themed things, but the pumpkin stripe (which I see now I have covered up in the photo) reminded me of my Japanese penpal. I will make her a little table topper, and if I start now, I have a chance of finishing and mailing it to her in time.
When I didn't find the cornerstone fabric in the first shop I went to, I had to go to another. In both shops, I was distracted by the first bolts of fabric I saw as I walked in! The two on the left are new from Clothworks, which I found at the first shop. The purple floral from P& B was found at the second shop. I love the colors. No idea what I'll do with these. I just hope when I figure it out, I will have enough.Everything's being washed now so I can get some sewing done this afternoon.