Early Learning Apps: Kids as content creators

I've been lucky to have access to an iPad for the summer, and I've experimented with the next level of apps for my young children.  I don't want them to be just consumers of information, but also content creators.  These apps are excellent and have free and paid versions.

Cookie Doodle: measuring ingredients and creating cookies

Paint Sparkles: art and music

Puppet Pals: create and animate puppet shows