If you've got a list of supplies to keep available for your kids oil pastels should make the cut. Oil pastels are vibrant, inexpensive, and have so many applications! I've used oil pastels for many things but this is new! Check out the single ingredient to turn oil pastels from crayons into paint!
Intro to pastels for kids: blending with oil pastels. I teach blending, but have never offered an activity sheet to practice like this... It make be very useful for differentiation, to help students that may otherwise struggle with understanding blending. It could also act as a means of assessment to gauge their understanding.