AlomWare 64 by Paul Bowlay is an extremely cool wallpaper app for Windows 7/8/10.  This program not only gives your background a cool retro look from the days of the Commodore 64, it takes the retro look and integrates live stats from your PC plus so much more.  There are many backgrounds to choose from, many more than the three screen shots I've included.  Head over to http://www.alomware.com/a64.htm to get more details and get the latest version.