How about one of these gift ideas:
1. A collection of Kurt Vonnegut's books - You could get a few of his popular books like "Slaughterhouse-Five," "Cat's Cradle", and "Breakfast of Champions" so your friend can dive deep into his writings.
2. Kurt Vonnegut T-shirt - There are several T-shirts available with quotes or references to Kurt Vonnegut's books printed on them. Your friend would love to wear it and show off their love for Kurt Vonnegut.
3. Kurt Vonnegut mug - If your friend likes coffee or tea, you can gift them a Kurt Vonnegut mug featuring a favorite quote or book cover. Every time they have a sip, they'll be reminded of their favorite author.
4. "So It Goes" engraved bracelet - "So it goes" is a famous quote from "Slaughterhouse-Five" that's loved by Vonnegut fans. You can find bracelets engraved with this quote and surprise your friend with this thoughtful and personal keepsake.
5. Kurt Vonnegut-inspired art - You can look for art prints that feature quotes or themes from Kurt Vonnegut's books, which would make a perfect decoration piece and keep your friend's love for Vonnegut alive.
Or you can get her/him a star map with an important date you share.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.