title: Change text color for cells using TableGrob
body: <p>Is there a way to individually change the color of the text of a cell when using tableGrob and ggplot2?</p>
  
  <p>For instance in the code below it'd be great if the cell with 1 could be blue and the cell with 2 could be red, with 3:8 all black.</p>
  
  <pre><code>library(ggplot2)
  library(grid)
  
  mytable = as.table(matrix(c("1","2","3","4","5","6","7","8"),ncol=2,byrow=TRUE))
  mytable = tableGrob(mytable,gpar.coretext = gpar(col = "black", cex = 1))
  mydf = data.frame(x = 1:10,y = 1:10)
  
  ggplot( mydf, aes(x, y)) + annotation_custom(mytable)
  </code></pre>