It's pretty difficult suggesting anything to the first question - It's a bit like asking how big is a bucket, how high is a building , where should I hang my towel or what book should I borrow from the library?
If you really need help working it out tell us
1. What you like (you've now suggested dark ales and heavier lagers)
2. Whether you're completely KK or extract or specialty grains
More information would help although the answer is still as varied the kinds of materials that are used in buildings.
Brew a stout, a bock, a dubbel, a brown ale, a red ale........
Check the recipe DB and see what looks nice. Check beerrecipes.org and see what looks nice. If you want advice on what to do with one that you've selected or how to translate an all-grain recipe to extract or something along those liines you'll find people are very helpful. Your current question is very vague and has loads of potential answers, none of which are right.