There have been quite a few apps over the years since OS 4.7 or so that let you show dynamic information on your homescreen by editing your wallpaper. The latest to follow this trend is another cool app called HomeScreen Missed Calls by ToySoft. The app does a nice job of displaying your missed callers picture on your homescreen. You can show all missed calls or only ones that have pictures in your address book. There is also the option to show the date and number on the picture.
The cool part is that HomeScreen missed Calls also sort of acts as a wallpaper switcher. You select a wallpaper folder which can have anywhere from 1 to 256 wallpapers which will be selected at random and used as the background for the app. You also set it to a single wallpaper along with how often it changes.
You can find HomeScreen Missed Calls for $0.99 in App World