Here's a tip how to get free wallpapers for your iPhone very easily. This method is very easy to follow and it also lets you search for just about anything that you want to have as your phone's wallpaper. AND you don't even have to install anything to do this!
To get free wallpapers on your phone just open your phone's browser and go to wallpaper.flyapps.me. From there you'll be able to easily browse different wallpapers that are optimized for your iPhone just by swiping left or right on the screen. Even though it's a mobile website the experience feels very much like an app, without the hassle of having to install an app on your phone.
If you want a wallpaper of something that isn't offered in their default gallery, at the top of the screen you'll see a little search box that lets you search for anything in specific that you want for your wallpaper. Pretty much anything I searched for brought up great results.
To use the picture as your phone's wallpaper you need to follow the simple instructions that appear at the bottom of the page.
That's it, pretty easy to do, and no hidden catches.