PhotoJoiner.net

PhotoJoiner lets you join multiple photos together in a strip horizontally/vertically or in a grid and make a photo collage. You can select multiple photos, specify how to join them and whether you want any margin between them and the color to fill the margin with and PhotoJoiner will join them all and make a single image.

You can save the joined photos on your iOS device or share them on Facebook, Twitter or via Email.