Everyone seems to enjoy a fish aquarium for a screensaver. You get all the fishy fun without forgetting to feed them. This screensaver was actually created back in 2004 but lo and behold, it works perfectly even today on Windows 7 and should work on 8. It was ahead of its time as screensavers go offering 3D rendering and options like adding your own picture, background image and music. You can also skip bubbles and skip caustic effects (see screenshots). Simply extract the file in the zip, right click and choose install. Enjoy!