My nephews and I enjoy dinosaurs. Sent these modified items to them recently.
I also enjoy sending out "imaginary postcards" - cards from fictional people describing their fictional lives. These were inspired by an item written by Anne Herbert in 1978 about the Amanda Madison Memorial Nonsense Box. Amanda's notes weren't all made up, but most of mine are.
Here's something I sent to friends in Austria. The postcard image is from a 1959 comic book episode titled The Fantastic Typewriter. The author/typist is startled to see a horde of barbarians coming his way. He shouts out: "GREAT SCOTT! THE CREATURES OF MY IMAGINATION HAVE COME TO LIFE!!"