Themes

theme_gray()

Default ggplot2 style, gray background

theme_bw()

White background with grid lines

theme_classic()

White background, axis lines, no grid

theme_minimal()

Minimal grid and no border

theme_light()

Light gray background, subtle grid

theme_dark()

Dark background

theme_linedraw()

White background with strong grid/borders

theme_void()

Removes almost everything

theme_test()

Useful for testing/layout