We like Crayola Oil Pastels for any sturdier oil pastel for little fingers and Pentel for the finer Variation for more mature kids. We also definitely like Faber-Castell gel crayons which might be somewhere between crayon & oil pastel with easy coverage. Craft supplies you haven’t touched in 1+ https://artsuppliesonline.us/articles/texture-and-technique-exploring-unique-art-materials