I've come to learn that there are very few decent, useful writing prompts out there. My next post will be a few short prompts of what I consider to be "decent quality" and muse-ful.
Whilst stumbling, I came across quite a cute little site: oneword. You click a button - a word appears with a timer, and you have 1 minute to write anything. It's difficult, the pressure is immense! Anyway, check it out for yourself. Here's what I wrote:
I looked above, and there they were. They weren't big, they weren't scary, just... there. The bright light glinting off the broken glass, the cool damp of the morning breeze - it was a perfect scene.
You can also see what other people have written here: http://oneword.com/2008/12/hover/full.html