Great data filled website that is jam packed with examples of each different kind of data representation.
Below is a nice box plot of thesis lengths based on Masters Diciplines.
This American website is choc full of great data representations and analysis. At first it looks like it is dedicated to American Football, but a quick sift through the links on the right, or a scroll through the first page, and you’ll start to see the wealth of great resources available here.
http://thisisindexed.com/ is a collection of funny Venn diagrams and Graphs. You could easily use resources from it to create a fun lesson on either topic. Students could then create their own jokes using Venns or Graphs.