I've lost count of the times I've used directional fabric with HST's and realized I can only use half of them, or have blocks with both vertical & horizontal patterns. You can't cut them on folded strips or cut squares on the diagonal. To have all going the same direction, you have to cut triangles on a single layer of fabric, or strips all right side up. If it's only directional one way, you can save fabric. The frustrating ones are double-directional, such as little critters lined up in a row, or words.