I find Alphabet stories are a great way to write if I am short on time or ideas. They don't always go where I expect them to, or want them to, but it's about getting words down.
Give them a try, simply write the alphabet down the side of the page and write a sentence starting with each letter.
I look forward to seeing what you come up with.
Another extension of this, write a sentence using the alphabet as the first letter of each word.
For some examples of this, check out Richard Brown's post on Write Words.