Just a mention re the tute above, in case anyone is going to make their own blending board ... the usual advice is dont glue the blending cloth to your board ! I think the idea of not glueing it is that the cloth & its teeth have a little room to move. If they are glued down, it damages the teeth, I believe. I made one with the cloth from Wingham Wool ( which I think is more rust proof than some others) & I stapled round the edge.
I also made one of these with cloth from Wingham Wool (UK) and followed their instructions for making it. I haven't used it much yet, but it works well and seems a good way of blending wools to create interesting colour effects, and using up all the messy little left over bits of roving or tops that I seem to accumulate. I would be interested to know how others use the rolags that this produces. I don't want to spin it, but to use it in felting. Do I try to unroll the rolags?
Here is another tutorial. www.youtube.com/watch?v=WAwsggl3CMM&feature=share Looks very simple and easy. I still haven't come to this stage but since all sorts of bits and pieces of fiber started piling up I'll have to think about buying a board like this .