I arranged the buttons and then stuck them down with clear glue onto heavy scrapbooking paper before whacking the lot into a frame. The button-sticking part was completely painful but the end result was worth it. I don't have a photo, but I also printed out a card with the event, the baby's name and the date which I mounted onto matching patterned paper and stuck onto the back. Some of the buttons are newish ones of mine but most are from the big stash of old buttons from the button drawers that used to belong to my hubby's grandma.
There are some lovely button letters out there in internet-land. Inspiration from here, here and here.