Pimp Lock Screen for iOS 7 gives you tons of options that you can use to create a totally unique custom lock screen for your iOS device. Choose a new color theme, wallpaper, and slide lock shape to ensure that your phone truly reflects your personality and that you stand out from the crowd wherever you go. You can create as many lock screens as you like, but you'll need to pay to save or use them.
This app has a great Help feature that guides you step by step through the process of customizing your screen. The first step in customizing your screen is to choose a background image. This can be a new photo you take through the app, an existing photo from your camera roll, or one of the templates that comes with the app. When you have the background you want, you'll move to the first editing screen where you'll see sliding scales to adjust blur and alpha aspects of the image. Tap "Next" when you're satisfied with the adjustments you've made, and you'll move on to another screen where you can pick out a color for your notification bar. Next it's time to customize the banner on your lock screen by adjusting the color and tint, and then you'll move on to picking a lock design and custom colors for the lock slider bar.
When you've worked through all of the customization options, you'll find yourself back on the main menu screen where you can preview what your design will look like and save it if you choose. To save it and use it on your phone, though, you'll have to pay for an upgrade to the full app for $1.99. As noted, with the free version of the app, you can design as many lock screens as you want, but you can't save or use them.