I think it's well past time to bust out one of my favorite exercises (I was going to write my absolute favorite when I realized I've got a small collection of them now. Funny what happens after more than 300 days of writing practice).
So here's the deal: grab a collection of CDs, your iPod, or just wander over to YouTube. Pick a song at random, or surf through a couple until you find something that works for you.
Now take the first one or two lines from that song and use them as the first line(s) of your poetry or prose. As demonstrated by mine, you just never know where it will take you until you get there.
Bright Eyes - First Day of my Life
This is the first day of my life -
I swear I was born right in the doorway.
All that came before this moment
Was swept away by your fragile bouquet;
I know with each step that you take
That our love will never wilt or decay.
With sweet peace in our hearts and souls,
We stand side by side with nothing to fear;
There is no need to look around,
We know that all our dearest friends are here.
With two rings we are united,
Eyes shed only the happiest of tears.