These are complete themes which control all non-data display. Use theme() if you just need to tweak the display of an existing theme. theme_grey( base_size = 11, base_family = "", base_line_size = base_size/22, base_rect_size = base_size/22 ) theme_gray( base_size = 11, base_family = "", base_line_size = base_size/22, base_rect_size = base_size/22 ) theme_bw( base_size = 11, base_family = "", base