I've had some theme apps try to run as a mini-OS. This is a WYSIWYG, solid background app, that is updated daily.. so I always have new pictures to choose from. No ugly pop-ups, or bloatware like a lot of free apps. Good variety of different things, depending on my mood.
MrC's 2017 Background Images!
Need more .....more.....more!!!!!!!!!
It's a nice app.
Beautiful live wallpaper with butterflies. Clicking them changes the color!