Photop is a free app that lets you design creative photo collages.
Functions:
Stickers, wallpaper, frames and text boxes are just some of the many options available for the collages. The image editor even lets you increase, decrease, stretch or crop photos.
Activities:
Lets you share collages with friends quickly and easily not only through email, but also through social networks: Facebook, Instagram, Twitter, Flickr, Picasa, Tumblr, and Google Plus.