Need some advice on squaring pre printed panel
I purchased a festive Sea Life pre printed panel to make a wall hanging. I am using 4 of the 5 squares available which I separated. For the life of me I can not get them square, they are incredibly crooked. I starched them all very heavily and just let them lie flat hoping the starch would allow the fibres to go back into their original shape.... that didn't work, I have stretched it from side to side, pressed it trying NOT to stretch it.... nothing seems to work. At this point I have run a basin of warm water and have them soaking and hope that might help. I even pulled a thread across the grain and whoaaaa.... it is crooked..obviously printed not woven... I know I can't return it now as it's cut into 5 pieces....
So.... any other ideas??? Included the photo of the panel, I am using the 4 smaller outside squares. Thank you for any advice you can give!