I have been before looking for an online application to edit my images without thinking of any licensing and subscription. An online editor that you can be used even on your tablet (tried it with a mouse and keyboard) and your my desktop. With that said I have found Pixlr Editor.
Pixlr Editor has many feature that is familiar with Adobe Photoshop. I t has fill, magic wand, layering, and even a way to connect to your Picasa account. It is also wonderful to note that is a tool that is now under Autodesk. Try it now be clicking here.