Electro Wallpaper is a free app, and it contains many beautiful pictures of circuits, data bits, and other things that are related to electronics. The best thing is that it is easy to use and very easy to download. There are many options to set as your background, and all of them are very beautiful. You can even choose between the black/gray color scheme.

There are five different color schemes available in the free version, but if you want to change the color of the background or the color of the data bits, you can do that with the full version. The full version contains more options, and it is more beautiful than the free version.