Picnik. No registration is required for using this free application. Features noted on the home page are: photos fixed in a click, advanced controls can fine-tune an image, crop, size and rotate in real time, loads of special effects, numerous fonts and top-quality type tool, large assortment of shapes, functions on Mac, Linx and Windows and best of all---no download or installation.
Basic editing tools are crop, rotate, exposure, colors, sharpen and resize. There are currently thirty-nine different effects that are free, an array of stickers, four free touch up tools, seven free frames and numerous fonts.
When the photo has been redesigned click on save and share. It will be saved to your computer as well as to your history on Picnik if you have an account.
Collages, fancy collages (similar to scrapbook pages), shows and "keepsakes"(for a fee) can be created from your photos. I made a small show from a single image that I uploaded and altered using different effects. Each photo editing web 2.0 application brings added features. Certainly Picnik should be added to your online image toolbox; it couldn't be simpler to use with great results.