I had some spare time in November and created a Houdini Hair Card Tool [svenjanusch.wordpress.com], including a detailed tutorial [svenjanusch.wordpress.com] and the Houdini project. The tool is designed to generate hair and fur images, similar to the commercial software FiberShop [cgpal.com]. Open for feedback and improvement ideas.
More results can be found here:
https://svenjanusch.wordpress.com/hair-card-results/ [svenjanusch.wordpress.com]