ggthemes

The ggthemes package provides extra geoms, scales, and themes for ggplot2. To use them, load both libraries and add the theme or scale functions to your ggplot object using the + operator.

Example setup with mtcars data:

library("ggplot2")
library("ggthemes")

mtcars2 <- within(mtcars, {
  vs <- factor(vs, labels = c("V-shaped", "Straight"))
  am <- factor(am, labels = c("Automatic", "Manual"))
  cyl  <- factor(cyl)
  gear <- factor(gear)
})

p1 <- ggplot(mtcars2) +
  geom_point(aes(x = wt, y = mpg, colour = gear)) +
  labs(
    title = "Fuel economy declines as weight increases",
    subtitle = "(1973-74)",
    caption = "Data from the 1974 Motor Trend US magazine.",
    x = "Weight (1000 lbs)",
    y = "Fuel economy (mpg)",
    colour = "Gears"
  )

You can install the stable version of ggthemes from CRAN or the development version from GitHub using devtools.

To install the stable version:

install.packages('ggthemes', dependencies = TRUE)

To install the development version from GitHub (requires devtools and installing ggplot2 from source):

library("devtools")
install_github(c("hadley/ggplot2", "jrnold/ggthemes"))