Category Page

I am trying to create a nice category page. At the moment I just have 4 categories. I would like to display the category thumbnail (ideally with control over its size), then 200 words or so of nicely formatted description and then display them on a page without any products showing. I have only 3 categories so I would end up with a grid of 2 across and 2 down which would be perfect for me.

At the moment all I can see is the ability to put in a small quantity of description when you create the category along with a thumbnail but no ability to format either..

Many thanks
Paul