I am huge fan of Janet Fitch. Her novel, White Oleander is one of my favorite books of all time. I was thrilled when I found out she had a blog and even more excited to discover she posts her writing there from writing exercises.
Quite regularly, she posts short-short stories, as part of a semi-weekly series of short short stories base on a writing exercise, The Word. "Inspired by a simply word, chosen at random, write a two-page double-spaced story, using the Word at least once."
You can read Fitch's stories for inspiration and follow along with The Word prompts to write your own. Or, create your own prompt using a word that comes up in your day write from that.