is there one? i mean reeeaally high quality.

Here's one of the best: http://forum.toribash.com/showthread.php?t=91748

There are many tutorials about this in the tutorial forums here: http://forum.toribash.com/forumdisplay.php?f=20

If you want to increase your texture skills even more you need to play around with the program you use to make them and gain experience. Tutorials can give you a nice start. But as with everything else, I believe you need to have experience to be very good at something.