Firing up Crunchbang in dual screen mode (via arandr) made the cursor appear huge on some windows. A quick duck duck go search revealed this forum post, which had the correct solution: Just adjust your ~/.Xdefaults file to your liking:

{% highlight bash %} Xcursor.size: 16 {% endhighlight %}

(I guess the additional xrdb -merge ~/.Xdefaults is just cargo culting)