Wallpaper engine is a software on steam. It can change your wallpaper to a good picture , a dynamic wallpaper or a video. It is also able to switch wallpaper every 5 minute. You can buy it on steam on 120 ntd.
However I don't think I'll buy it. Because I know there are many similar technologies. In komica there used to be a discussion board about the kind of things. It is 螢幕攝. Although it is not available now. You can still search this key word to find a lot of teaching articles. It turns out that you can save the 120 dollars.