Many people start with ready-made patterns when they try sashiko for the first time. After a while, many people want to start creating their own motifs instead.
Most traditional sashiko patterns are based on simple geometric shapes such as lines, circles and arcs. Often the same shape is repeated across the fabric to create a larger pattern.
A common way to start is to draw a grid as a base. From the squares, you can then add diagonals, arcs, or other lines that create a repeating pattern.
By experimenting with different combinations of lines, you can create many variations. Even small changes in how the lines are placed can give a completely new expression.
This makes sashiko a technique where both traditional motifs and your own ideas can work side by side.