I homebrewed a Half-Elf Half-Drow race and called them Shadow Elves. They were originally inspired by FR, since there are so many drow that worship Ellistraiee that could potentially live with the surface elves.
Unfortunately for you, this homebrew is for 4e .
But they wouldn't be too hard to make in 3.5e. I'd suggest either LA +1 or LA +0 as a target.