How about a third option.. a glass mosaic tile that includes a browner, warmer golden tone as well as the cool of all the grays. It will work better with the tones in your floor tile. I would possibly consider changing the grout color to a more gray tone as well.It will pull it all together better Best of luck!

If you would like to send me a link to a different option I am glad to consider it

Like this one?

http://www.glasstilestore.com/collection/glass-tiles/brick-glass-mosaics/geological-brick-multicolor-slate-bronze-glass-tiles-1-2x2.html

There are a two links. There are so many options. Personally I feel that you are ignoring the huge element in the room, the flooring, but going ONLY all gray or sliver or very cool colors. There are tons of mixtures out there which include glass , metal, stone combinations and so I would suggest finding one that you like which has includes the warm tone that the flooring has. Best of luck!