Riddle: When I point up it's bright, but when I point down it's dark. What am I?
Answer: A Light Switch.
Riddle: I am the ruler of shovels, I have a double. I am as thin as a knife, I have a wife. What am I?
Answer: The King of Spades (from a deck of cards).
Riddle: I am a path situated between high natural masses. Remove my first letter and you have a path situated between man-made masses. What am I?
Answer: A Valley. 
What Am I Riddles
Riddle: The things I bite, they don't bleed, I don't bite until you push me; I bring my victims together each time I bite, But they'll come undone if you pull it just right. What am I?
Answer: A Stapler.
Riddle: I am served at a table, In gatherings of two or four; Served small, white and round. You'll love some, And that's part of the fun. What am I?
Answer: Ping Pong Balls.
What Am I Riddles
Riddle: I'm like a doll, But I'm not for playing; I stand up straight, but if windy I may be laying; I'm well-known and famous for having no brain; I work outside both day and night in sunshine or in rain. What am I?
Answer: A Scarecrow.
Riddle: They fill me up and you empty me, almost everyday; if you raise my arm, I work the opposite way. What am I?
Answer: A mailbox.
What Am I Riddles
Riddle: The more there is the less you see. What is it?
Answer: Fog.
Riddle: Lighter than what I am made of, More of me is hidden Than is seen. What am I?
Answer: An iceberg.
Riddle: First I am dried, then I am wet; The longer I swim, the more taste you get. What am I?
Answer: Tea.
Riddle: You can't see me, but I can see you; To be more specific, I see through. What am I?
Answer: An X-Ray.
Riddle: I don't have eyes, but once I did see. Once I had thoughts, but now I'm white and empty. What am I?
Answer: I am a skull.
Riddle: From the beginning of eternity To the end of time and space From the beginning of every end And the end of every place. What am I?
Answer: The letter E.
Riddle: I have no voice and yet I speak to you, I tell of all things in the world that people do. I have leaves, but I am not a tree, I have pages, but I am not a bride or royalty. I have a spine and hinges, but I am not a man or a door, I have told you all, I cannot tell you more. What am I?
Answer: A Book.
Riddle: I have four legs but never walk I may be covered in flowers but have no soil I hold food three times a day but never eat a meal. What am I?
Answer: A table.
Riddle: You can drop me from the tallest building and I will be well, but if u drop me in water I die. What am I?
Answer: Paper.
Riddle: I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business. What am I?
Answer: A Vacuum Cleaner.
Riddle: I have four wings, but cannot fly, I never laugh and never cry; On the same spot, I'm always found, toiling away with little sound. What am I?
Answer: A Windmill.
Riddle: Pronounced as one letter, And written with three, Two letters there are, And two only in me. I'm double, I'm single, I'm black, blue, and gray, I'm read from both ends, And the same either way. What am I?
Answer: An eye.
Riddle: The more of these you take, the more appear behind you. What am I?
Answer: Steps.