Hello, #lazyplus.  I’m looking for an android app that takes up the whole display, reacts in some way when you touch…

Hello, #lazyplus.  I’m looking for an android app that takes up the whole display, reacts in some way when you touch it, but doesn’t keep any state.  Just sort of a visual toy (as opposed to a game of some sort) that my 9 month old can play with while we’re traveling.

I’m looking because this morning she was playing with the lock screen on my wife’s phone, and she loved the way the dots lit up when she touched them, and the little lines that showed up when she dragged her fingers around.  Any ideas?