Collaring ritual?

Hi guys, I need help. I am about to be officially collared by my Dom and we both agreed that it should be an important ritual, just for the two of us. The problem is, he presented me with a task to do some research and find out what such a ritual/ceremony should include and how it could look like. I was searching through some bdsm blogs and Fetlife, but couldn't find anything useful. Maybe someone here has any ideas. Please help.