You’ll get loads of ideas on Pinterest. Choose a theme your little one is already showing some interest in. Could be a toy he loves playing with or a book he loves reading.
Marvel theme. You can find some amazing ideas on Pinterest.
You can try Mickey Mouse inspired theme. Kids generally love Mickey and fam!
Averagers are very famous and loved by each boy.
Doraemon theme, soccer theme, Lego theme, Superman theme
You could go for a pirate theme. Or take inspo from the movie Up.
A space station. Constellation, Galaxies, Astronauts.
Boss Baby theme would also be apt