This is taken from a post of 2005 which I can't find on the site anywhere but I had kept it and would like to share it with anyone interested. I have not used any of these but at the time of the post everyone was raving about this post. Take it for what it is worth. Hope it helps.

Receipe for hypertufa - different looks:

Hypertufa Mixes

1) GRANITE LOOK -I

1 part perl/verm

1 pt cement

2 parts peat

2) POROUS TUFA-LIKE

1 part sand

1 pt cement

2 pt peat

3) LIMESTONE LOOK

1 part sand

1 pt cement

1 pt peat

4) GRANITE LOOK II

3 parts perl/verm

3 pt peat

2 pt cement

5) SANDSTONE LOOK

1/2 part sand

1 part cement

1/2 part peat

Approximate quantity for #1:10 quarts per part

All parts measured by volume

Treatment of Trough

Brush with stiff wire brush to remove shart edges and smooth look of poured concrete

Score sides with chisel or knife

Allow to dry slowly in a shaded spot 3-4 weeks or in big plastic bag with humidity under sun.