Sparklines are an interesting form of dataviz, because of how small they can be compared to how much meaning they convey. It’s a great data to ink ratio! Here are some examples, using Metricsgraphics!
Here is a small talk I gave at Springload about integrating D3 into React.
Here is a small experiment: animating pie charts on hover!
Here’s an experiment, with an area chart that changes its shape based on a financial calculation.
Data interpolation makes a big difference to how charts renders. Here are all of the built-in interpolations of D3.