Writing prompts can be found every day, every place. 
Just listen, pay attention and write it down.
Complete the sentence and keep on writing.

1. It was a special morning...

2. When I opened the door...

3. When I was old...

4. What a surprise...

5.When I smell ____________, a memory floods me with...

6. The sound of __________ reminds me...

7. I see ______________ vividly as if it is happening now...

Other sources of inspiration:

Personal photos
Favorite music
A short letter/note