OK, so you have some gin and you want a drink. There's sugar in the sugar bowl, and a cucumber in the fridge. Unless you want the gin straight, you have almost everything you need for a Sunny and Dry, and Wine Enthusiast's Cocktail Recipe Shaker will show you how to make it.
To be fair, you'll need a few more ingredients for the Sunny and Dry (unless you want to remove them), and the same is true for most of the recipes the shaker offers. Still, it does a great job of introducing you to new mixed drinks and cocktails that use very common ingredients as bases. This simple webapp asks you to pick a spirit, a mixer and a garnish based on what you have lying around (or just enjoy drinking.) Make your selections (with a little urging from the site -- it may suggest a mixer or garnish based on the spirit you choose) and the shaker will generate a recipe for you at the bottom of the page.
We've talked about the home bar essentials you need to make just about anything, so if you have a well stocked home bar, you shouldn't have any trouble here. If you do see something particularly tasty, you may need to run out and grab some extra ingredients, but don't be afraid to experiment with what you already have. Some of the best cocktails were invented completely by accident.
Cocktail Recipe Shaker [Wine Enthusiast]