BGS - description from Softdepia.com:
BGS gives your computer the ability to automatically download a specified JPEG or GIF file and convert it to BMP format. You then have the option of setting it as wallpaper. You also can load images from your local disk. When connecting to any available Internet BGS/IS server, you can choose pictures by subject, using the different server channels. You can also use it to prevent your phone line from hanging up in case of traffic inactivity.
BGS is a "Free to try" program. You can download and try it for an evaluation period.