There are many graphics softwares which can help you create a lot of art or other interactive stuff. But if you want to teach children with those softwares, you need to simplify it. 'Scratch' makes it easier for young children to learn art and other stuff for free online. You need to download the software programme from the site which your child can use offline as well.
What is 'Scratch'?
It is a programming language for children. You can create interactive stories, games, music and art - and share them online.
According to 'Wikipedia':
'Scratch is a computer application aimed primarily at children that allows them to explore and experiment with the concepts of computer programming by using the simple graphical interface. It was proposed and developed by the Lifelong Kindergarten group at the MIT Media Lab by a team led by Mitchel Resnick and first appeared in the summer of 2007.
Scratch,which is available free, can be installed on any Windows or Mac OS X computer with various installation options for computers running Linux .'
Site link: 'Scratch'