PicMonkey

It is a free photo editor with Collage, Effects, Filters, Frames and Stickers.

PicMonkey is a free photo editor with Collage, Touch Up, Teeth Whiten, Fonts, Effects, Filters, Frames and Stickers.

The PicMonkey icon appears in Chrome's app launcher on the New Tab page and from there you can upload your images in order to edit them.