I use only YLI thread glazed cotton hand-quilting thread - it is cheap -$4 for 400 yds - $8 for 1000 yds....I do have to order it online - favorite place is
http://www.roserushbrooke.com/yli-quilting-1000.html She is quick to mail out and wonderful to work w/. The shipping is also reasonable. I've gotten stuff from her in 3-4 day(FLA to OH)
I would probably use the grey - which is a darker grey, not a silvery grey.
Another thread - also from YLI is a varigated thread that has gray, blue and dark pink in it...that has to get thru the actual YLI website. It is called Sticks and Stones.
http://www.ylicorp.com/product.aspx?...0-3911b032b4f4
It might be worth a phone call to YLI to make sure they have the product in stock. The first time I ordered from them, I got my thread in 6 days(did include a weekend) This last time, I had to wait almost 3 -4 weeks because the stock was low/out.
ETA: YLI site has a list of local vendors, there just aren't any in my neck of the woods...