At our wedding (which is just 9 days away, I'd like to add) we are using miniature envelopes as name cards.
We're using three different colours to represent the choice of main course that people are having, which will be a great help to our servers (so long as people don't remove the envelopes from their places!). Having tried unsuccessfully to find a fourth colour of envelope for our children's option that was the right size and fitting with the colour scheme, I decided to take matters into my own hands and make my own envelopes for the children.
At the end of the school year when we were sorting out the classroom, a number of books were heading straight for the bin, so I took them into my care, knowing that they'd be more use to me than to a landfill. The first job they had after being rescued was to be turned into envelopes. I have enough books to kit out a whole card shop with envelopes, but for now, here's a few that will be featuring at the wedding.
Also, it just so happens that the book I chose was written for a boy called John, about a boy called John - how perfect!