I'm experimenting with these two media to see if they are compatible in any way for mixed media drawing/painting. If others have done this, I'd love to see your work. I managed to get decent marks with the two, but not happy with my paper choice. I'm going to try some archival construction paper and some softer Canson drawing paper with re-touch spray for the pastel. It did work quite well with very light coloring of the crayon and a layer of soft pastel on top, then tapped to get the loose bits off and then sprayed to seal. As I said, just experimenting, but I am really encouraged so far with this one little sketch on some very cheap pastel paper.
I know that there are a few artists that work with Crayola successfully (Don Marco), and that is greatly encouraging. The pallet range is practically endless with Crayola as it is with soft pastels. They could be a marriage made in artistic heaven!