Example... when you install Meme Generator it creates a memegenerator folder within that folder it caches Favorites, Instances, Generators, and sharesMy idea is an app that would scan folders and mark if the folder is useless or not. Especially the unknown data folders that say something like com.fatsecret.android and have nothing but random .dat files or a .nomedia folder/file. Almost like a registry checker for a PC.
when you delete the app it doesn't remove this folder or any of its contents
Another idea is to have an app that scans the SD card and locates all media. It would tell you how many of what type of file you have on your phone, and allow you to mass move to selected folders (Not copy or transfer but actually move th file to its new location)
im no programer but these would be great apps if they were to be developed