I think a memorial wall would be nice. A place we could leave our thoughts, poetry, personal experiences we shared, epitaphs to our friends in their passing. Maybe with the ability to leave little icons, flowers, art we shared…
I also think it would be nice if their profile page could have, under the decease notice, an unobtrusive memorial box where we could do the same and also link to our individual posts on the memorial wall. Otherwise, I think their profile pages should stay the same, most importantly a working Responses button, so we can reminisce the good times we had in all those run-away party threads and other fine Fluther moments.
It is good for the family and loved ones to see and facilitates termination, an integral part of coping with loss.