A free program for Android, by Girls Games and Puzzles.

Adults Coloring Game is a free offline game for girls and women. Here, there are plenty of cute images for your to color. It is a great app for exploring your creativity and showing your artistic style as there is a wide range of tools available for you to use. These include a huge color palette, glitter colors, various brushes, neon effects, stickers, and more! It is definitely not your ordinary and basic coloring app.  

While using this app, you will also enjoy relaxing and calming music. You can listen to them while coloring or painting. Moreover, this does not require an Internet connection, so you can enjoy using this anytime and anywhere.