Any minecraft superflat preset genorators that actually work?

I recently lost my world that I was building on, so I decided to start another on superflat. Then, looking through websites, I found I could customise it. I thought this was the best idea in the world! But frankly, I'm too lazy to code it myself, so I needed a generator. All of the generators I had tried, however, would crash my minecraft when I put in the code. It may be they don't work for 1.7.4 or it may be that they just are faulty. If anyone has tested abd knows there's one that works, please could you give me a link.