I'm getting in a right pickle flicking between the three pictures and looking at what you need to change in the 2nd two to make the first, so I decided to just look at the first and work out what is where!
It looks to me as if it's a pineapple block with three rounds of logs added to the centre square. The centre square is white, then it has black logs added to the side, then white across the corners, repeated 3 times, the square is approximately twice the size of the logs.
The 2nd picture has more logs and it looks like the diagonal log is added first, if you were just to make the centre square white on this picture and merge it with the first lot of white triangles and then not do so many rounds, it has 5 then you'd have the first quilt.
The 3rd picture is confusing as it has a couple of vertical logs the same colour as the diagonal logs, but if you changed them to cream, then the cream and pink would be black and the red would be white!
Cheers Anne