After my previous post I came across some interesting related content.
More Head Tracking
I also decided to take a look at r/arduino and quickly spotted an interesting related project which uses the Wiimote as part of an Arduino powered Light Brush. The reddit thread credits this blog (http://liightbrush.wordpress.com/) with the idea and links to this blog (http://mrarduino.blogspot.co.uk/) about the implementation referenced in the reddit post.
A bit of further googling turned up http://kenfrederick.blogspot.co.uk/2009/08/lightbrush.html which was an interesting post about trying to implement a light brush. This post also links to some other similar projects such as the Lightscythe.