Is there an iPhone app I can use to make a picture collage without adding borders?

I know apps like PicStitch, Piccells, and Photo grid aren't what I'm looking for.

I think you can use Fotor for iphone or SnapStory to make a picture collage without adding borders.

Especially you can choose try the SnapStory which i found in the the fashion blog.

http://www.fotor.com/iphone/index-pes.html