create new theme for ggplot

from: http://sape.inf.usi.ch/quick-reference/ggplot2/themes

theme_complete_bw <- function(base_size = 12) {
  structure(list(
    axis.line =         theme_blank(),
    axis.text.x =       theme_text(size = base_size * 0.8 , lineheight = 0.9, colour = "black", vjust = 1),
    axis.text.y =       theme_text(size = base_size * 0.8, lineheight = 0.9, colour = "black", hjust = 1),
    axis.ticks =        theme_segment(colour = "black"),
    axis.title.x =      theme_text(size = base_size, vjust = 0.5),
    axis.title.y =      theme_text(size = base_size, angle = 90, vjust = 0.5),
    axis.ticks.length = unit(0.15, "cm"),
    axis.ticks.margin = unit(0.1, "cm"),
 
    legend.background = theme_rect(colour=NA), 
    legend.key =        theme_rect(fill = NA, colour = "black", size = 0.25),
    legend.key.size =   unit(1.2, "lines"),
    legend.text =       theme_text(size = base_size * 0.8),
    legend.title =      theme_text(size = base_size * 0.8, face = "bold", hjust = 0),
    legend.position =   "right",
 
    panel.background =  theme_rect(fill = NA, colour = "black", size = 0.25), 
    panel.border =      theme_blank(),
    panel.grid.major =  theme_line(colour = "black", size = 0.05),
    panel.grid.minor =  theme_line(colour = "black", size = 0.05),
    panel.margin =      unit(0.25, "lines"),
 
    strip.background =  theme_rect(fill = NA, colour = NA), 
    strip.text.x =      theme_text(colour = "black", size = base_size * 0.8),
    strip.text.y =      theme_text(colour = "black", size = base_size * 0.8, angle = -90),
 
    plot.background =   theme_rect(colour = NA, fill = "white"),
    plot.title =        theme_text(size = base_size * 1.2),
    plot.margin =       unit(c(1, 1, 0.5, 0.5), "lines")
  ), class = "options")
}