The If Found Lock Screen app for the iPhone, iPad, and iPod touch allows you to add messages to your Lock Screen wallpaper. Most people use it to add their contact information to the Lock Screen, so that if their iOS device is ever lost, whoever finds it can easily get in touch with them.
You can add as many messages as you need. Just drag and drop to move the text to any location. Double tap to edit the text. You can enter any text that you want, as well as change the font, color, size, and alignment of the text. You can also change the color, transparency, and width of the background color bar behind the text.
You can choose any photo from your Photo Library, or pick from the free wallpapers that come with the app. Move the photo by dragging, and resize it by pinching. Double tap the photo to choose a different photo.