Here are some that I took when I did the Singing Squares Course at Pinewoods with Nils and Ralph. If you use any of these, I just ask that they be credited to me. High resolution versions should be able to be downloaded from flickr without any login.

I particularly love this pair of photos:

https://flickr.com/photos/jhm4/6032533416/in/album-72157627409253900/

https://flickr.com/photos/jhm4/6032533882/in/album-72157627409253900/