Coloring ACF ggplot Object
<p>I want to produce ACFs with a color scheme of my choice.</p>

<p>the forecast package allows me to create ggplot2 graphs of the ACF. I can change just about every aspect of the resulting graph except for the lines of the ACF and the confidence bounds. </p>

<p>Here is sample code and the resulting plot:</p>

<pre><code>acf &lt;- forecast::ggAcf(rnorm(100))

acf + ggtitle("Autocorrelation Function (ACF)") + xlab("Lag") + ylab("ACF") +
  theme(
    panel.background = element_rect(fill="#5C5D67"),
    axis.title = element_text(colour="#FFFAFF", size = 12),
    axis.title.x = element_text(colour="#FFFAFF", size = 12),    
    axis.text = element_text(colour="#FFFAFF", size = 12),
    axis.text.y = element_text(colour="#FFFAFF", size = 12),
    panel.grid.minor = element_blank(),
    panel.grid.major = element_line(color="#1E1E1E"),
    plot.title = element_text(colour="white"),
    plot.background = element_rect(fill = "#1e1e1e")
  )
</code></pre>

<p><a href="https://i.stack.imgur.com/q3zw8.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/q3zw8.jpg" alt="enter image description here"></a></p>

<p>How do I change the colors of the ACF lines from some thing other than the default black? And how to I change the confidence bounds to something other than the default blue?</p>