What app for the iPhone to use when making year end collage?

I want to make a year end collage with about 50+ photos or something in that range (the more the better).Is there an app that allows me to do this? Been searching for one but all I can find are the apps that let you insert up to give or take 10 photos.

If you get your photos to a PC, you can use PhotoSpills to build collages with hundreds of photos. Its easy and free.

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