A free program for Android, by Mattie S Thomas.

Color by Number – Coloring Book for Adults & Kids is a pixel art game that will teach you the basics of numbers and colors. It’s a great way to have fun and develop your motor skills, at the same time, it helps you to learn to count and recognize colors. You will find a large collection of images that you can choose from. All of them are created by professional artists. There are lots of categories that you can choose from, like flowers, animals, food, landscapes, and more. So, if you want to create your own masterpiece, you don’t have to go to a studio. All you have to do is open this app and start creating your own masterpiece. It’s a sandbox-style coloring game that will let you create your own masterpiece and share it with the world.