I made them a birthday banner with removable numbers that can be used forever and ever. Here is a link to the pattern.
It took DH and I two weeks, but he finally found the two clusters of flowers that have been in mom's cedar chest since my first memory. (yes, a little cleanup in my house would go a long way) I have no idea where these came from but they are at least 60 years old. There are matching necklaces too, but I'm keeping those for the time being.
I really wanted to add some family treasure to the banner. Mom would have loved to see her granddaughter's wedding. This way she can stay in their lives for a long time.
To keep the numbers from getting wonky over the years I also made a little box to contain them. For this I used Peltex 72, which is fusible on both sides.
There are two sets of numbers, so the banner can be used right up to 110 years of age.