In the February ’14 meeting of the Twente R User group, research master student Karel Kroeze gave us a quick run-through of the many possibilities with the ggplot family of functions and building blocks. Although a bit intimidating at first, the R code is immensely flexible once you get the hang of it. Have a go at his code (click here to get the code) from the presentation and see if you can accommodate his code for your own cool graphics! For the accompanying data files, mail Stephanie. Guus provided some extra helpful links, see Tim Churches, CEB institute and cookbook R.
Twente R User Group 