Glass tile - I have picked out 6 x 6 bright blue glass tile and am having trouble picking out what grout color to choose. Any ideas?

Do you have any pictures of the tile? I would steer clear of white because it could be hard to clean. Maybe grey?
 
Your PB should have grout sticks you can play with. None of the colors can go wrong. White & Light gray will make each tile pop a bit where the medium gray will help each tile blend into the other. BOTH look great so it depends on which look YOU like the best.

I agree with @elleb in that I would not go with the white as we all know how hard white is to keep clean.
 
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