A pool requires administration, which is one more task, and who needs that? :D So my suggestion is this: if an image on Flickr relates in any way to the spirit of 43Folders, GTD, pens, paper, productivity, etc., tag as you would regardless, then add the tag "for:43folders".

That would generate an easily-found grouping of images and notes, but would not require administrating, etc., at the link http://www.flickr.com/photos/tags/for:43Folders.

It would also generate the feed http://api.flickr.com/services/feeds/photos_public.gne?tags=for:43Folders&format=rss_200.

What'cha think? :)