Be aware of what the shape of lines can convey. Sharp edges could indicate tension, crispness, hardness, formality, or high tech. Soft edges and curves may be softer, flowing, more casual, or more personal. Even small changes in line thickness, endings, or shape changes can alter the look and feel of a design. Try drawing sets of patterns using only black or white lines that illustrate static, dynamic, or random line patterns. Experiment with line width, spacing, and using horizontal, vertical, curved, and even diagonal lines.
How can you use line in a composition to make it more active? Or still? What direction of line conveys more action? Or serenity? What emotions can you evoke with line alone? What does changing the weight of the line do to your composition? Or changing the texture of the line?