HTML canvas: how do I create these distorted circles?

I'd like to automatically generate the circles in the attached image, but I don't know if it's possible. Ideally, I'd select a few colors, and then I'd use canvas to create these stacked, semi-random, distorted circles. Could someone point me in the right direction? I've only used canvas to draw basic shapes, but haven't done layering or distortion...or masking.
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A mix of alpha-blending, masking, gradients could possibly make it work. I can only point you to some useful links.
Tom BeckCommented:
Looks like circles with varying stroke thicknesses layered on top of each other.

Here's a jsFiddle that simulates the effect from that perspective;

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zumpoofAuthor Commented:
Wow, thank you for putting the work into this, Tom. This is exactly what I was looking for.
Tom BeckCommented:
You're welcome. It was fun. Thanks for the points.
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