Bill Cipher Windows 10 Theme is well known for the triangular demon from the dreams with his one eye and a big black hat. It is yellow and runs through gravity to reach the real world. This theme is available for Win 10, Win 8, Win 8.1. It has 15 HD wallpapers. The theme shows Bill wandering around the world, and shows many situations he had been encountered with. It is drawn carefully and with an eye for details with pretty humoristic features, which is also typical for this character.