Great design  needs some work. The design of the app is great  I know you are going to focus on memory optimization  but you need to add and change some things. There needs to be an option to disable downloads of wallpapers over mobile data. You also need to make the blur and dim sliders more responsive. You also need an NSFW checkbox  just in case there are those kind of paintings. Hope you consider the feedback.
September 21 2014