You should go to your local hospital and speak to the NICU staff (Nurses or whatever) My oldest Grandson was in the NICU wen he was born for several months - and while we were there several babies passed I saw these lovely memory boxes they made for the family that included photos and such too (If the family was there we had to leave usually) but a couple of times no one was there, they putt up a screen and took great care preparing the infant and such I am sure they will have ideas o f what to make...
We were lucky Jacob is now 9 and very healthy!