Interactive websites for stress relief

A few sites I've come across that are interactive and fun to play with. I found them, along with a number of others, on a post on tumblr stating they are good for people with anxiety/stress relief. Just fun sites to calm to you down and give you something simple to focus one.

In the first one you get to create your own galaxies

In this one you create interesting symmetrical designs

& lastly here is one to just let play when you need some calming sounds

enjoy!