1) A picture of my great-aunt Annie
This is quite unusual. It's made almost like a badge is, with the back pressed into the picture. It's a photo I already had, but it's very special to own the one which actually belonged to my great-grandmother and was probably on display in her house.
2) The marriage certificate
Obviously I had applied quite some time ago to get a copy of this, and so had all the relevant information already. You'll see it points out things like the occupation of the participants' fathers, their current residence, age at marriage etc.