Alex Gollner, a regular here on FCP.co has posted a free 8 point garbage matte filter. Always a handy tool for matting out unwanted objects and you can't beat free!
The new effects building link between Motion 5 and Final Cut Pro X has opened up a whole range of possibilities to build and save complex effects. Alex is one of the first to publish a new custom effect, a pretty cool 8 point garbage matte. He's posted more information and links in our forum.