Originally Posted by greensleeves
If you frame each one with perhaps 1 1/2 " strips and then square them all to the same size. The frames will be slightly different sizes-widths- but by such a small amount you should hardly notice it. I've done this and it does "trick" the eye. Hope this helps.
I've done this on a few occasions. If possible, make your frames a dark color to help with 'tricking the eye'.
Best of luck!