Pixlr is a great set of image creation and editing tools.
Pixlr offers web-based image editing tools as well as image
editing tools to use on Android phones and on iPhones.
Pixlr Editor is Pixlr's most full-featured image creation and editing tool.
You can create drawings from scratch using the pencil and coloring tools that they provide.
Pixlr Editor also has options for uploading images or importing images from other places on the web.
The selection of creation and editing tools is huge.