This is a very late answer, but one of the things that my friend’s widow asked of his friends a few years ago (after he died of cancer) was to send whatever photos they had of her deceased husband so their still-young children can have more photos of their father.
Perhaps after the memorial service, you can compile a photo album (whether it be a physical album or via an online photo sharing site) containing photos of your friend that you’ve collected over the years. Since she is a long-time friend, you may have photos that her family do not have, but would be grateful to receive copies of.
My condolences to you.