Colors

par(bg="gray")
par(fg="yellow")
boxplot(mtcars$mpg ~ mtcars$gear,
        ylim = c(0, 60),
        xlab = "gear (col.lab)",
        ylab = "mpg (col.lab)",
        main = "Color parameters (col.main)",
        sub = "subtitle",
        col = "blue",
        col.axis = "red",
        col.lab = "green",
        col.main = "red",
        col.sub = "purple")
text(2, 55, cex = 0.7,
     labels = "col = blue; col.axis = red; col.lab = green; col.main = red\ncol.sub = purple; par(fg='yellow'); par(bg='gray')")