PixMaestro

This app allows you to create amazing new photos from any combination of old photos, new photos taken from your device camera, labels, app-provided fun stickers and background images.

Furthermore, you may move and scale any aforementioned objects to compose your masterpiece photos, and you may add picture frame to the background image and any sub-photos. Added to that, you may change sub-photos' shape from square to circular, or vice versa.

Finally, once you have created your new picture, you may email it to your friends, add it to your device photo album, print it out via your printer, or post it to the PixMaestro Gallery. The Gallery allows you to share or delete your picture to/from the Gallery, and to view and like other users' pictures.