Here is some basic work I did in Photoshop. The normals were generated with the nvidia filter. Ignore the seam in since the brick and rock texture don't blend together yet. I was just testing how they would look when rendered. Let me know what you think.
Alex
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Alex
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The two materials themselves make for a bland combination. Cobblestone beside a brick wall is inherantly going to look repetetive and bleh next to eachother, moreso when it's in grayscale. I'd recommend practicing on a more interesting or complex surface type, or even a prop.
Judging by the light, I'm also gonna guess you're using Maya. If this is true, stop trying, find a 3rd party shader, and never try using Maya's normal setup. It's riddled with issues from not being able to support spec maps simultaneously, to having extreme rendering issues. Again, find a third party normal rendering app, or import it into a different program.