Answer:
I won't write an entire story for you, but I can give you some prompts!
1. A princess wakes up shrunk down to the size of an ant in her father's castle. How will she fix this? Who will help?
2. A man, who was from the modern world, wakes up in fairy-tale land. How does he get out, and who does he meet along the way?
3. A dragon, once feared and dangerous, is turned into the body of a mouse. How does he get out, and what does he learn along the way?
If these seem cheesy or far-fetched, don't worry- that's what fairytales=folktales are all about. Good luck, and comment if you need more help :)