We saw one of these blue stop signs on Oahu in Hawaii and I was curious as to why this one was blue. We had never seen a blue stop sign before. It mentioned several blue stop signs on Oahu but we never saw any others.
I saw a layout several years ago with a geometric pattern of mats and corners - this is not exact, not even close because I don't remember what the other one looked like. I just played with the papers until I got a pattern I thought was interesting.