Drawing Circles and Ellipses in R
Whether you use circles as visual encodings or as a way to highlight areas of a plot, there are functions at your disposal.
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How to Hand Edit R Plots in Inkscape
You can control graph elements with code as you output things from R, but sometimes it is easier to do it manually. Inkscape, an Open Source alternative to Adobe Illustrator, might be what you are looking for.
How I Made That: Animated Square Pie Chart
Also known as waffle charts. Using animated transitions between values, you can allow for comparisons between categories.
Using Color Scales and Palettes in R
Color can drastically change how a chart reads and what you see in your data, so don’t leave it up to chance with defaults.