I use quite a bit of vanilla extract and the price always makes me flinch! So I am having a go at making my own. Very similar to the blueberry gin instructions - put vanilla in vodka. Leave. Done!
1 cup vodka
2 vanilla pods (the recipe I read called for 3 but they are expensive! I'm hoping I can get away with 2 if I leave it a bit longer)
Cut the pods almost all the way along their length (leave them joined at the top). Put the vodka into a clean glass jar (clear lets you see how dark it has got). Push them down into the vodka so they are submerged. Leave in a dark place for 8+ weeks until it has developed a dark amber colour. Pour into dark glass bottles.
* Update *
This worked perfectly. The vanilla extract is dark and tasty. I keep it in a cupboard with the pods still in the jar rather than decanting it (unless I am giving some away). When I am running low I can just top up the vodka a few times. Eventually I will need some new beans but so far so good!