Log into Google Chrome Themes Gallery and you’ll find a lot of theme files with extension .crx. By default, Chrome will automatically apply this theme if you click the download button. However, if you can just download this .crx file, change it’s extension to .rar, and decompress it, then you’ll find a .json file and a folder full of resources. These resource files have no file extension. But we can infer from the .json file that they are images. Change their extension to .bmp, and you’ll find good background images which can be seamlessly tiled.