Recently I came to know about online paint program called SUMO Paint. It has similar interface like Adobe Photoshop and tools to create & edit art. What I really liked about it is, you don’t have buy any software, don’t worry about installation. It’s image editing in browser, check it out.
It has some really cool features like Shape trails, Gravity, Symmetry tool along with Shape tool, Layer with blending mode, wide selection of brushes, Ink brush tool, Filters, Gradient tool.
Application interface – Visit sumopaint.com & let your creativity flow 
Sumo Paint
Have a look at these images created in Sumo Paint.
Author - Xaviaro
Author - Rafffellll
Author - Xaviaro
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I think that it’s a brilliant idea! I wonder what they will think of next? Wait… let me rephrase that…
I wonder what they haven’t thought of? :>
Great post! I bet you put a lot of research into it.