One possible theme could be love. Maybe the 'big red one' is a symbol of love, like a big red heart - shaped object, and the story is about different forms of love such as romantic love, family love or friendship love.
A theme of discovery could also be present. Suppose the 'big red one' is a mysterious object that has been hidden away. The story could be about the characters' journey to discover what the 'big red one' is, what secrets it holds, and how it impacts their lives once they find out.
Survival is likely a theme. How people manage to stay alive in the aftermath of a nuclear war, with scarce resources and a hostile environment.
If such a story existed, one possible theme could be the exploration of identity. The trucker's life on the road and his gay identity could be in conflict or in harmony, showing how he navigates through different aspects of his self.
One possible theme could be discovery. Since it's about a big box, there's likely something to be found inside, like new opportunities or hidden treasures.
One possible theme could be size. Since it's a big pig, the story might explore how being big affects the pig's life, like it might face difficulties in moving around or might be intimidating to others.
One possible theme could be family. Indian culture places a great emphasis on family values, so the story might revolve around family relationships, like loyalty, sacrifice, or family disputes.
One possible theme could be perseverance. If the big blocks are obstacles, the characters in the story might need to persevere to get past them.
Love and commitment could be a major theme. After all, it's a wedding story.
One possible theme could be perseverance. The racers keep going no matter how difficult the race gets.
One possible theme could be adventure. The little red car might be going on an exciting journey to new places.
One possible theme could be friendship. Koko, the red dog, might form deep friendships with other animals or humans in the story.