Instructables and Howtoons

Worth another mention:

Instructables and Howtoons are great websites that one can use ideas to create and build their creations.

There are instructional manuals.  These manuals encourage creative problem solving skills.

At Howtoons, their mission is "to provide engaging content".  Using comic format, kids can build things.

This site offers PDF for downloading comics and the site features a content search.
http://www.howtoons.com/

The following link will connect you to instructables. There are downloadable PDFs available.
http://www.instructables.com/id/Toothpick-Bridge-Project/