Google just launched an in-browser drawing tool called Chrome Canvas. You can simply choose the pen style (pen, pencil, marker, chalk), color and thickness, then draw on screen. You can also import a photo and draw on the phone.
When you’re done with your masterpiece, you can export it as a png file.
I love this, because I often want to draw a red circle around something to highlight it for this blog.
To use Chrome Canvas, just type in canvas.apps.chrome in the Chrome address bar — or in the address bar of any browser that supports WebAssembly, such as Firefox.
(Once it’s open, I recommend, create a shortcut to it on your Bookmarks Bar so it’s always a click away.)