Thanks for the suggestion! Similar to what my quilting mom (shaverg) recommended and I think I may do 4 in the middle, one in each corner and two in the middle of the far sides.
Or I could do an X with just 8 of them and leaving one blank in each corner.
I can't print more, as these were printed professionally by graphic designers and cost a lot of money, so I don't really want to spend more.