Here’s the description for my new Cydia app ImageExplorer:
ImageExplorer helps you find and use images on your iOS device. Similar to AudioExplorer+ and VideoExplorer, this app searches the contents of other apps for images files (even images without file extensions) and lists them in an easy-to-view format. Once found, you can add the images to the camera roll, open them in other apps, send them in an email (multiple files sent as zip archives) or even set the wallpaper directly, without using the camera roll (iOS 7 only).
Images can be found either in the apps tab (which lists the files by app), or in the files tab (which filters out empty folders and non-image files to make it easier to find what you’re looking for). Tap once to see a preview of an image, from which you can also view all image files for that app or in that directory at once. Tap twice to use the image as wallpaper or lock screen background. Tap the button on the right to open the image in another app, or add it to the camera roll. You can also add several images at once to the camera roll, either tap and hold to switch between single and multiple selection modes, or use the action button on the upper right.
And here are the screenshots for the new app: