iPad Looking for a "paint", drawing package for my kids

[iMas70]

I'm looking for a package that my 7 year olds can use to "paint" and draw on my iPad. I grabbed a DigiTools Paint Pack along with a Disney Creativity Studio the other night. Both seem pretty good. The Disney package looks more advanced/detailed.

https://www.crayola.com/products/digitools-paint-pack-product/

http://store.apple.com/us/product/HD488VC/A/disney-creativity-studio-deluxe-stylus-with-app

What do you think? I'm also open to other suggestions.

Thanks!