I started using Freeboard (http://freeboard.github.io/freeboard/) in the latest project. It's also really snick and requires no front-end coding. Worth checking out!
The OP's project is also pretty cool.
But how does it compare to OP's project? Does it have more graphics choices?
https://github.com/christabor/flask_jsondash/blob/master/sch...
The big ones are d3, c3, and plotly. Those cover 99% of what you would need.