You’ve discovered an underground shelter on the farm you just bought. Describe it. When was it built? What was it used for?

The main character from one of your stories decides to spruce up his or her house by painting each room a different color. Which colors are selected and why?

Something’s rotten in your refrigerator. Write a scene in which the condiments residing in the door shelves plot to take over the prime real estate on the top shelf, front and center. Will milk be spilled? (And who’ll be crying?)

Remember the Vogon poetry reading scene from Hitchhiker's Guide to the Galaxy? Have a go at writing the worst poem in the universe.

One of your fictional characters was in an accident and won’t survive the night. Write the character’s obituary for tomorrow’s paper—include relatives, accomplishments, work history, etc.

You’ve been given a one-year deadline and a $1 million signing bonus to write a 300-page novel. It’s the day before the deadline and you’ve written one page. What are you going to tell your editor? Write an elaborate excuse that’s so clever and believable that it becomes the plot of your novel.

While waiting for your baggage at an airport, you notice a young woman at the baggage carrousel. Although it’s daytime, she's wearing a black strapless evening gown, high-heeled shoes and coordinated jewelry. She collects a box wrapped in brown paper. What’s in the box? Who’s she meeting? Why is she dressed to the nines at the airport?

When you walked into class today, there was a huge purple elephant in your seat. (Continue the story)

Recall your most embarrassing moment. Describe how your worst enemy would feel if he, or she, witnessed the moment.

Write about the most interesting person you've talked with today.

Read through old diaries and journals to relive your memories. Nostalgia can get your pen moving.

Take a dictionary dip: Open the dictionary at random and point to a word. Compose a short personal essay using this word at least once.

She hugged the tree as she looked down at the ground far below. How did she get in the tree? Why is she there? What happens next?

Think about something you once wanted so badly but never acquired. Write about how you think your life would’ve been different if you had received what your heart desired.

What makes you want to scream? Make a laundry list of all the stuff that irritates you. Now, make a list of all the things you enjoy or are grateful for. Aaaahhh! Doesn't that feel better?

Rewrite a common phrase, such as "It’s raining cats and dogs," in the style of three famous authors (e.g., Stephen King, J.K. Rowling and John Irving).

Who would you like to have been in a past life? Who would you have hated to be? Write a scene of dialogue between those two.

Write an apology letter without using these phrases: "I’m sorry," "It’s my fault," "I apologize," etc.

Play descriptive Taboo: Pick an object in your living room, then list the five most obvious words you'd need to describe it. Then write a vivd description of the object without using those words. Repeat with an object from each room of your house.

Print a copy of a well-known poem. Separate each word by cutting or printing on individual pieces of paper. Form a new poem with the words. Then rewrite your new poem substituting any words you want.

You've won a pair of round-trip airline tickets to anywhere in the world. Where would you go, with whom and why?

Think about the first gift you remember receiving. Describe it. Who gave it to you? How did it make you feel?

You’re stranded in a library or bookstore for 24 hours. In what section do you spend the most time? Why?

Describe getting ready for a first date as someone of the opposite gender.

Finish this sentence: The difference between laziness and writer’s block is…

Write a description of yourself from your pet’s point of view. Consider your appearance, actions, values, etc.

You’re unhappy with the politics in D.C. and decide to secede from the union and form your own country. Your country can only be as large as the land you own, whether it’s a studio apartment or a cattle ranch. Describe your country. Do you plan to expand? Write your country’s constitution and a bill of rights.

Summarize your current work-in-progress in back-cover blurb style in 100 words or less.

Open a baby name book and randomly pick a name. Write a brief history about a character with that name. What’s in his pockets (or handbag)? What are her hopes, dreams, desires, fears? Outline a story using that character.

Take song lyrics and write the background story to tell the song's inspiration.

Read a horoscope for today. (It doesn’t have to be yours.) Write about a character who’s experiencing what’s described in the horoscope.

You’re going to be on a new reality TV show. Describe the new show and your role on it.

Pretend you're a cartoon character. What special powers would you have and what would you do with them?

Think about your dream job. Now think about three aspects of that same job that wouldn’t excite you.

If you could go on only one more vacation in your lifetime, where would you go, and why?

One day you awake to find you possess superhero powers. What kind do you have? Are you using them for good or evil?

Write a letter to your future husband, wife, child, etc., and tell them about your life before they came into it. If that person is already in your life, write from your past perspective.

At what moment in your life did you feel most proud? Write an essay about the experience.

Describe your father: his hang-ups, strengths and mannerisms. What does he look like? What are your feelings toward him?

Write a story about a character born on February 29. How does he feel when it’s not a leap year and his birthday doesn’t come?

Ride your bike, skateboard or walk exactly 15 minutes in any direction. Stop, and write about the place in which you’ve arrived.

Think about the qualities you seek in a mate. Write a character description of someone who looks and acts the complete opposite.

If you could talk to any literary character, who would it be, and what would you ask him or her?

For one day, don’t look in the mirror. Throughout the day, write down your feelings on being denied access to your self-reflection. Also, describe how you envision yourself to look.

Pick five words at random. Using a thesaurus, find an alternative for each word. Write a story using all 10 of them.

Look in the mirror, and write down what you think. Are you being too hard on yourself?

Pretend you’re an editor reading another magazine’s article. You think the article is awful. Why? Describe what’s wrong with it and what you would change.

Select a book or movie and write up a witty, thorough review of its merits and flaws.

You’ve lost your best friend’s most prized possession. Why did you have it in the first place? How do you tell him or her? What’s his or her reaction?

Select a book from a random shelf in your home library. Copy down the last sentence, and use this line to begin a short story.

Write an ode to a person you love or hate.

Write a story in which the main character is in an argument but is obviously in the wrong.

Tell the story of your ancestry. Begin as far back as possible. Fill in any missing details with creative thinking.

Write a story to include, “Sorry, we can’t insure you for a journey like that.”

Write a short story set around your favorite pastime.

Sources:
http://www.writersdigest.com/writingprompts.asp