First you need to get the filter itself, available online from http://www.redfieldplugins.com/index.htm. The filter only works on windows systems, so unavailable for Mac users (at least at the moment). Sorry Crowley!

Once you have followed the process for adding filters to your graphic program (usually a restart is needed to make it available) you can start to use it.

Choose a photo to use

There are a number of different effects you can chiise from within the filter, and you can alter the parameters of each one by moving the sliders, and if you have the preview option ticked, you get a real time preview of the change.

I increased both vibrance and saturation on the image before selecting the sketch01 option within the filter.

Remember, if you select part of an image it limits the effect to that selection.

You can obviously stop at anytime the effect produces an image you are happy with, or you can continue to add other effects (or even put it back through fractalius itself for some interesting results)!

For this image I added the Mosaic Tile effect while reducing brightness and increasing the contrast.

I finished it by adding additional lighting effects, and altering the hue, saturation and lightness.

Different images suit different effects from within fractalius on its own, and with a bit of imagination and experimentation, using layers and other effects, there's no limit to what you can do!

Hope this made sense, and have fun.

I have a number of different images altered with fractalius on my blog at http://www.myfinepix.ru/blog/152/339912, and Hoggie and others have fantastic examples already on here displaying the result.