What the AppMosaic Cydia tweak does is bring a new method for discovering applications to your iOS Device. AppMosaic is actually not really a Cydia tweak however, it is more of an application.

Upon launching this app you are displayed the top 200 free and paid Apple App Store applications in a mosaic pattern. When clicking one of the applications in this mosaic pattern brief details are displayed and upon tapping on the info panel you will be redirected to that apps page to download it.

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*Thanks to iJailbreak for info
*thanks to IDB for video