I was thinking more about this today.
I have set up a flickr group called boards exhibition. I was going to suggest that anyone who was interested could sign up and submit one photograph to the group and that we might use this pool as a demo idea of what kind of photographs are covered by the group. Someone suggested that local authorities occasionally have funding for this sort of thing and I think it might be possible to write a reasonable proposal to the arts officers perhaps to highlight the social and community building aspects of loose groupings like these.
One thing I would insist on is that each person interest only submits ONE photograph. One only. I'll leave it around as an idea for a few weeks while I start drafting funding requests and also identify potential locations and targets of this.
If you're not on flickr but are on pix.ie let me know and I'll see about making a tag. I don't think groups are set up there yet. What I could subsequently do if pictures are split across the two sites is host the final full selection on one of my own sites of which I have more than one anyway.