I'm so pleased and relieved that you like the mosaics. Thank you all for such wonderful comments on my work! Very kind of you all.
Oh my gosh, that 2nd one is utterly amazing, all 3 are fantastic. Is that silver grout??
The grout for all three is a dark brown, like chocolate. I think the silver you're seeing is either mirror or paint. I used silver paint on the edge of the switch cover, and flowers piece.