Dog gone it! Been there done that! It looks like it is just the edge blocks that are short. If I had enough fabric, I would cut larger replacement blocks. If you are short fabric, it is time to add a design element. You could add an inch or more of one of the other fabrics along the outside edge of the triangles you already have. Recut the triangles to position the added fabric in from the edge a bit so they become a design element and don't look added on. Your blocks are really cute!