by 
The Curious Bag
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<h4 class="dechead">On One Hand: Blend Colors
If the marble tile does not contain much variation, matching the grout to the marble tile color will result in a uniform look. The room will appear bigger, as the floor will appear more expansive since its flow will not be broken up by grout lines.
On the Other: Contrasting Colors
If the marble tile contains a lot of variation, choosing a matching grout color can be difficult. Selecting a contrasting grout color can ensure that the grout serves as a neutral background, allowing the tile itself to be the focus.
Bottom Line
The variation of the marble tile should be taken into consideration when selecting a grout color. If the tile is a more uniform color, closely match the grout to the tile. If the tile has much variation, use a contrasting grout color. Both methods will keep the focus on the tile itself versus the grout.
Source:
FloorTalk.WFCA.org: How to choose a grout color
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