Which style do you prefer for a battle tile?

[Wannabehero]

I like the last one the best myself. I don't think lining up the tiles will be to much of a problem as long as you get yourself a seamless stone texture that fits the tile space exactly (shouldn't be to hard, if you need one I can send you one of mine).

For the floor texture, I personally would prefer one mid-way between the first style and the other styles. Perhaps you could take the floor texture from one of the latter styles and try putting a very minor blur on it (like 1 pixel) to make it seem deeper in the image?

EDIT:
I tiled out the last style piece and see that the texture is indeed almost seamless, and looks really good IMO. I also blurred the floor flagstone texture with a single pixel gaussian blur and I really like the look. The detail is still there, but the focus is fuzzed just enough to make it seem like background.