Know a easy way to create seamless isometric tile?

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Abomination

and still not seamless.

I was wrong there:sorry... Just forgot the original texture was already seamless. --blush--
But:

Rotate canvas by 45 degrees
Scale the Y to 1/2 (if it's 64 make it 32)

Yes, it's seamless(forget about the green line(just there to show direction)),
but it's tilted.
(if the texture were to represent long grass, I don't want it to look as if a storm swept it to the ground) so I want the black lines to stay horizontal and vertical.
Not as easy as it may look on first glance,is it...