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.
In the "Advanced" logo design example, the lines that make up the triangle (letter A) go from thick at the bottom to thin at the top. They also suggest a set of steps (advancement) leading upward.
Notice how the round line endings give the hammer -- drawn freehand with straight and curved lines -- a softer feel.
The second version of the ifiche logo design uses rounded line endings and more curves (in the fins/lashes). Notice that a different typeface is chosen for each, to match the style of lines.
You can also create interesting patterns with a series of repeating lines. None of these designs rely on color -- although changes in color can further change the appearance of the lines.
