That's really cute! It looks like it would need one partial seam.
I'm making some blocks for the border on my Giant Dahlia and I sewed all the strips together to cut into strips of squares then changed my mind about the block I wanted to do. I found that in order to use what I had already sewn I had to do a partial seam.
It turned out well though. The center of the block is white and I'm pressing all 4 sides outwards and it gives it a really nice look.