The basic pastry dough is made using the basic dough color mix with a bit of extra ochre colored clay. Here are the instructions to mix ochre and the instructions for basic brown mixes if you are using primary colors of clay.
For open pies and pie slices it is more realistic to use a double layer of dough. For the second layer, take your basic pastry mix and add a bit of extra white and translucent. You will apply the lighter pastry color to the inside of the pastry case in the next step.