Here is the last Cork I Spy pouch I made at Retreat. The lining fabric is one of my favorites and I just had a bit of it left. I had just enough for the large lining piece.
In general for the three pouches, I found the cork to be easy to sew, but not easy to turn. If (when?) I use cork again on an I Spy pouch, I will definitely round the corners. I think it will make the project much easier to turn.
All that being said, I thought the corners looked fine when I finally did get the pouch turned. I gave these to some work colleagues and they loved them.