One way to “preview” how a Skinner Blend between two colors will look, before committing to to a larger quantity of clay, is to make a small sample. Using two postage stamp sized pieces of clay- cut and divided on the diagonal into triangle shaped pieces and then mixed on an ultra thin setting on your pasta machine..
Another way is to preview it online by using the color mixing feature found at 3schools.com. By clicking the “Mix” link next to each color name, you can experiment with making a blend between two colors.
I found it particularly interesting to experiment with blending darker 
colors to different variations of the very light valued colors. In anticipation of using a tinted white in a Skinner blend, for example, try a green to a very light orange.