I just saw a post about this awesome app and I wanted to share.
Hello crayons is a free app but if you want extra colors etc., it does cost but you can definitely use the free version and be happy with it!
The neat thing about this app is that you can use it for digital storytelling. You can also use Educreations in conjunction with Hello Crayons. You can also have students work on their spelling or vocabulary words. The possibilities are endless with this app for early childhood students. There are 3 other similar apps (color pencils, chalk, paint)
Check out this video below for a presentation about the app!