Pan Lower right Transition

Hi all
I have been looking for a transition very similar to FCPX Pan Lower Right. The effect pans across stills and clips from the timeline - they look like photos set against a table top. Great effect but I would like to customize the tabletop.
I was hoping (I couldn't find any on the WWW) there would be a FREE effect someone has generated?
This is what I'm after more or less - store.pixelfilmstudios.com/product/photo-collage/
However I dont think the background can be customized
OR
Does anyone know if the FCPX Pan Lower Right is editable??

Many thanks

two answers:
honorable board member Ken offers for free a PhotoAlbum effect:
www.fcp.co/forum/generators/26890-free-photo-album-generators

and he has produced several others, similar 'bunch of pics fly around' effects, just dig in our plugin depository

and:
yes, 'Pan Lower Right' is editable in Motion: just right-click on it an select 'Open Copy…' (Motion has to be installed on your Mac)

oh, and Welcome, Martin, to fcp.co

Just tried double clicking and opening in Motion. Perfect workflow. Haven't used Motion before but all seemed logical and have already sorted the background out.
Many thanks for the tips.