Lines are used to help separate text, images, and other objects. By using lines you can bring greater clarity and organization to your page.
Splash! allows lines to be any width you like. Often it is based on the page size used. If the width of the page is 640 then it's unwise to make the width of the line greater than the page.
This is the thickness (or height) of the line.
The line can be of any color that you wish This allows you to change the color if it is hard to see on a particular background color or image. A colored line cannot be shaded.
This allows shading to be applied to the line. You can not combine both coloring and shading, shaded lines can be grey only.