PhotoCollage.com

PhotoCollage.com is a tool to create online photo collages. This is a web application that works on PCs, tablets and smart phones (iOS and Android) without downloading anything.

You can use it to create Facebook, Google+ or Twitter covers and header collages. You can also choose from collage templates already on the website or create free form collages.

Use it to create your own personal photo collage and share your collages online.

Image source