These are the photos I've gathered for possible use on the website. There are 33 including those already being used on the test site.
I like some for the interesting abstract pattern they create while also suggesting coming together, building, hubs, networks.
Others I like for their direct applicability (FHA, construction, hub cities, meetings, etc.)
I've combined the higher resolution ones in the PDF (see link below) that I tried to email. On the chance you can't open or download this, I've pasted the images as well.