u/rithpath has an android changer here /u/mjbauer95 also has a wallpaper changer for win/mac/linux. u/Ugleh and others have a customizable wallpaper changer for your computer or android device! If you're interested, click here. If you want to browse using large thumbnails, reddpics and Panoptikos and redditjs are options. Linking to Flickr? Please be considerate and link directly to the large(est) version of the image.
People like knowing what they're getting without wasting clicks: please, put the resolution in your post title. Want to download an Imgur album? Imgur Downloader is a painless way to do it. Have a request? Try the cleverly named /r/wallpaperrequests! A more general image request? /r/PhotoshopRequest might be what you're looking for. Here's your warning: Break one of these, win a free ban. This means that your image MUST BE landscape orientated, not portrait. Images MUST be at least 1024 wide by 768 high. (NSFW text? /r/Offensive_Wallpapers is probably where you need to be.) (Not that NSFW? /r/gmbwallpapers might be what you want.