I really like that you're thinking conceptually, expressing "square edge" instead of just saying that and the image not going with it.
That's what makes me like the last 2 best, though 3rd from last is interesting too. I have no idea what "brn" stands for, so I woudln't get the "square edge" idea in those. You know?
Fave is the second from last, I especially like how the square ironically lands on a curve (whether you meant that or not. :D) I'd suggest maybe darkening the background behind the white type, to help it stand out more. It's getting just a little lost right now.
Very nice.
