Aquamix sells a grout colorant that is quite effective.

You've discovered that a light colored grout causes the tile to pop. If you can;t get an exact color match to hide the grout, then sometimes a neutral color...along the lines of the natural gray or pewter in the chart below...works well.

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Mongo

I looked through the threads and saw that Bill V recommended matching the grout color to the tile color, but how do you match when the tile varies from dark green to a light yellow-green?

Vary the grout color!! Use one color for the accent tile, and another color for the field tile.

Thanks! I will run the idea of the aqua-mix by my tiler. If I use the pewter color, for example, for both the already grouted (in bone-color that I want to change)and the newly grouted, will the grout colors match?

Bill--I think you misunderstood my problem. Yes, the field and the accent tiles are two different colors, and I am now thinking I will use two different grout colors. But my problem is that the accent tile itself is comprised of about 5 different shades of green. So, I was wondering if it is better to go with the darker shade of green or the lighter shade of green for the accent grout color?

Based on the color chart mongoct sent, I think I will try the pewter or natural gray. Is it reasonable to ask the tiler to do a sample on some spare meshed tile pieces?

Thanks!