Maybe silliness isn't the right word, but calling it art seems kind of weird.
I have a few different... let's call them autodrawing apps for lack of a better term... on my phone and tablet. On my phone I'll use them if I'm waiting for something and don't feel like checking twitter or playing a game (ah, modern life). On my tablet it's sometimes distraction when I have a headache, sometimes wanting something to do with my hands, and sometimes just being too lazy to find something to do.
I don't, I should make clear, use them for meditation or trying to clear and/or focus my brain. I know some people have luck with that, but my thought processes just don't work that way. For me, it's just idle fun.
The odd thing, though, is that I often find myself somewhat drawn into the art aspect of it without realising it. For example, I have two kaleidoscope-type apps; one of which aimed at adults and the other just at entertaining kids. I get artsy with both of them, sometimes without meaning to. I guess some things are just ingrained within us somehow.
Anyway, here are a few of my latest down-time "art" offerings. Of these, Magic Fluids (the one that looks sort of like an aurora borealis) is the only app that I've actually paid for the upgraded version because I find it fascinating. The shot you're seeing here is from the free version, though.