Depends where you live or the buildings is located as to what is traditional.
Look at pictures of any of the 'old' cities and you will see a mixture of tones and materials.
Do whatever feels 'right' to you is what I always say.

It also very much depends on how the stonemason has cut the stone, for example in a poor fellow's cottage the stone might not be dressed. On a Cathedral it most definitely would be.
Also the type of rock, whether it be igneous, metamorphic or sedimentary.
Basically, the best way of tackling the subject would be to get out there and take some pictures

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Darrell.