Crayola's huge collection of lesson plans.
Crayola's lesson plan library contains 1766 free lesson plans. There are lesson plans for every grade from pre-K through 12th grade. As you might expect, the lesson plans incorporate one or more Crayola products, but you could probably substitute in similar products made by other companies. The lesson plans include step-by-step directions as well as a list of standards addressed by in the lesson.
All of the lesson plans on the Crayola site have an art component, but many cover topics in other areas. For example, this lesson plan on storytelling traditions is based upon a couple of brief history lessons. And this lesson plan for high school students focuses on using whiteboards and dry erase markers in group or individual problem solving. You can search and browse Crayola's lesson plan catalog according to grade level, subject area, and topic.