Posterize or create an oil painting effect in FCP X?

Once again my memory is giving me h e l l !

My first DV camera contained a number of canned effects such as "Posterizing" which instantly gave a blocky image reminiscent of an oil painting.

The image below was made using Photoshop's "Oil Painting" filter . . . posterisation was more extreme.

I am also convinced that there was a simple posterising filter in maybe Final Cut Express but now after loads of googling I can find no trace of such filters in old or new editing apps.

Any suggestions on a quick and easy way to achieve the effect?