I Writing Prompts
- Turn ordinary animals into monsters that prey on humans:
dog-sized rats, killer rabbits, or a pack of rabid mountain
lions. Give the animals intelligence and set them loose.
- Silvery flakes drifted downward, glittering in the bright light
of the harvest moon. The blackbird soared.
An asteroid and a meteoroid collide near Earth, and
fragments rain down onto the planet's surface, wreaking
havoc. Some of those fragments contain surprising elements:
fossils that prove life exists elsewhere in the galaxy, for
example.

taking into account that a theme is the central topic a text treats and can be developed through a story, play, poem etc. the following are themes that can be further developed:  

my best friend jeffrey has many unusual interests. (the story could be about each of the unususal interests)

once a man gives his soul over to evil, he can never go back. (this could be a saying or a proverb)

the three sheepdogs lay around the yard all day. (it could be developed detailing how each of these sheepdogs lay around)

a priest's collar has an unusual effect upon people. (it could be developed detailing the different effect upon people)

innocence is a powerful force in a world full of corruption. (it could be developed detailing how is a world full of corruption)

king lear is a play shakespeare wrote later. (it is just a sentence and doesnt give any idea or topic to be discussed in details.

evil often wears the disguise of innocence. (this could be a saying or a proverb)

what novel are you talking about?

that is based on your opinion not an answer someone can just give you unless you want to lie on your opinion. no offense wasn't trying to be rude. tip: use words like instead of don't put do not and you get what i mean