Hi all, although not directly related or possibly too useful directly within TG (although could drive some interesting height fields maybe) Allegorithmics Substance Designer v3.5 is on sale with 50% off for the non-commercial version (which I believe is identical to the commercial version just it is not licenced for commercial work). If you use other 3d apps in conjunction with TG you may find it helpful.
50% off means it is £38 or $50, it's a good deal I would suggest if you are interested.
Anyway, in case anyone is interested,
Steve