title: Change ggplot factor colors
body: <p>I notice that here <a href="http://docs.ggplot2.org/0.9.3/geom_boxplot.html" rel="nofollow noreferrer">Box and whiskers plot</a> the call:</p>
  <pre><code>p + geom_boxplot(aes(fill = factor(cyl)))
  </code></pre>
  <p>generates bright red/green/blue colors for boxplots fill, while:</p>
  <pre><code>p + geom_boxplot(aes(fill = factor(vs)))
  </code></pre>
  <p>Generates a distinct pale green/red of colors. In my data, I get the second set of colors, but would like the first set (like in</p>
  <pre><code>p + geom_boxplot(aes(fill = factor(cyl)))
  </code></pre>
  <p>What controls which set of colors ggplot uses and how can you change it?</p>