I like to take existing recipes (beerrecipes.org, byo.com, or beersmith.com) and tweak them based on my taste. I usually darken the lighter ones by adding a half pound of crystal 60 or at least add to the grain bill to give it a little extra kick. I have also been known to add some DME to get my OG around 1.065 - 1.070. Then I double the aroma hopps. I usually end up pleased with the result. I plug everything into beersmith2 and it gives me a pretty good idea of things like how much water to use, target temps, and ballparks my gravity readings so I know I can stay on track. I can't say enough about beersmith if you are going to experiment. You pick your style and put your recipe in. It gives you an idea what the color will be, IBU's, ABV, all the good stuff you will need if you want to stay in a style and it will warn you if you are getting too out of control. (Is there such a thing?)