I luuuuurve metallic thread. Not a little. Not a normal amount, either. A lot. I used it on my Ceiling Tiles quilt:
And my Diamonds and Emeralds II quilt:
Point being, I luuurve metallic thread. I just finished up a quilt for Modern Quilts Unlimited, and I straight line quilted it with a matching thread and a tight, 1/2" grid. But it needed something more. Something like...
My husband said something along the lines of "I normally think the metallic thread is too much. But this time, I like it." To which he got a mouthful from me as to why there is no such thing as "too much metallic thread".
I use Sulky metallic thread, since 1) I can grab it at JoAnns' with a coupon, 2) I've heard it recommended by art quilters (and they know their funky thread), and 3) it's always worked for me so far! You definitely need to quilt a little slower with it, though. You can check out my post on how to use metallic thread here.