Applications like DipTic are popular to arrange multiple images in a frame. Now the new app Layout is a valid addition or alternative.
We find the app easy and fun to use. There is clearly some room for new features. The effects are a bit limited. This may actually be no problem because you want to use other effects apps anyway. Here is the resulting image (saved to Camera Roll directly from Layout).
Our good friend Terry Banet create a more interesting sample in mere 3 minutes:
Learn more about Layout.