RETIREMENT
The sky on their last day at work.
Pick their first day on the job, or their last, and see the space photo from that day. If you can find both, put them side by side.
Which date to choose
The last day is easy. The first day takes some asking around, and HR usually has it on file.
What a card looks like
Three dates we picked to show the idea. Yours will be different.
SB-2011-07-06
UNCOMMON 
SKYBORN
The Rho Ophiuchi star formation region, where hydrogen peroxide has been detected in space (annotated)
ESO
SKYBORN.APP
SB-2022-02-27
UNCOMMON 
SKYBORN
Earthrise 1: Historic Image Remastered
NASA APOD
SKYBORN.APP
SB-2023-05-13
UNCOMMON 
SKYBORN
Apollo 17: The Crescent Earth
NASA APOD
SKYBORN.APP
What you get
The photo from that day, what it shows and who took it, and a card you can download or send. It's free and there is nothing to sign up for.
A date before June 1995?
NASA's daily space photo started on June 16, 1995. For an earlier date the card shows a real telescope photo from the part of the sky that belongs to that day's zodiac sign.