Sherry, a teeny tall won't make a difference if all the blocks are the same height but it will make a difference in the width, But, I do have a suggestion. If you put the trees on each end instead of in the middle ( this MAY be what you're doing anyway ) it won't matter a smidgeon if a teeny bit of the outer trees fall somewhere into the border seam line. If you take a picture, some of the trees are only shown as a partial tree and it looks cool. Do I have this pictured wrong in my mind?????????????