Most designs on this site are available as free, downloadable coloring pages (for non-commercial use), in three different line weights.
Ironlines are strong, sharp, and dark. They are forgiving to the occasional errant stroke and lend a high-contrast air to your coloring.
Shadowlines plainly guide the way, but are light enough to allow you to add your own colors to the entire page.
Ghostlines are for the keen of eye and steady of hand. designs may not be visible on your computer monitor, but should show up when printed.