What you will need....
3-4 vanilla beans
1 small bottle of vodka
1 Med-large bottle of vodka
Take the vanilla beans and splice them down the middle. Drop them in the small vodka bottle and shake.
Make sure the vodka completely covers the beans. Store the bottle in the dark for a few weeks, until the vodka turns dark brown. Use it as you would any other vanilla extract. Use the larger bottle of vodka to re-fill the small bottle after each use, make sure that the beans are never sit exposed to air so that they do not mold. I have been using my vanilla for years and have a friend that has been using hers closer to a decade.
Now... if for some reason you don't want to use liquor.... you can replace the vodka with vinegar. :D
More DIY:
Dish Detergent
Window cleaner
both of the above also have more links for many many more cleaners as well :D Check 'em out if you haven't before!
Make sure you check out the comments on the Dish Detergent, there is a FANTASTIC link for laundry detergent by one of my commenters! :D
I got my beans from Rainbow Grocery but if you need a link... You can go here to get your beans!