If you're stressed out after a whole week of work, web app Xoki will relax you by creating a custom, blank, colour-changing background in your browser.
Take some time to stop, maximise your browser and kick back with a relaxing colour-changing background. Xoki consists of only a colour picker, from which you can create a "playlist" through which the background will slowly shift. You can pick from a few different palletes — I've found that "soft" is far more relaxing than the other, far too bright palletes — and then just move your mouse off to the side. The tool will disappear leaving the colour shifting background filling up your window.
It's a little silly, sure, but it's not a bad way to take that last coffee break without having to look at all the work in front of you. Besides, we already know that breaks can help keep your productivity up, so as long as you've got your next task ready to go, there's nothing wrong with taking a minute to yourself. Hit the link to check it out.