The website Your Dictionary explains different types of riddles and contains several examples. Daily Brain Teaser is a blog which contains many different types of thinking puzzles including riddles.
Here's an example; Three eyes have I, all in a row; when the red one opens, all freeze.” The answer is traffic light.
After reading through several riddles we attempted to create our own. First we thought of an object and then wrote 2-5 sentences describing the object.
Here's what we came up with.
7 Year Old Daughter
I do not see you in the day. I see you in the night.
Answer - Bat
I am prickly in the sun.
Answer - Cactus
13 Year Old Daughter
I am way up north or south. I can be pink or purple but am primarily green. I normally come at night. I'm created by the Earth's magnetic field.
Answer - Northern Lights
I am leg extensions. I was invented in medieval times.
Answer - Stilts
Even though I'm dead and gone I'm still worth a lot. In fact, I travel all around the world each and every day.
Answer - Benjamin Franklin $100 dollar bill