I think this is a fantastic idea. Especially since suicide still has a stigma attached, I think there are many many people who would appreciate this way of being able to come out and show their grief and support.

stigma story: One of my co-workers (not one I knew well) committed suicide about a year ago. By chance, I wrote something on our intranet recently where I linked to a older page with a lot of photos, one of him, a nice close-up of him smiling. I was asked (ok, told) if that wasn't a bit "unappropriate"...

That made me so sad, as if the only appropriate behaviour after a suicide was to pretend that that person had never existed.