What a pretty block. I played with it some in EQ7. It was too much light for me. I, also, turned your 4 on point squares into a square in a square block and snowballed the outside pieces of blue, which for me became purple. Here are a couple of versions that I would make in a heartbeat.
Edited to add: I didn't even notice the secondary pattern until I posted this. Cute, Cute, block!