my suggestion is royal blue, to accent the narrow stripe in the tartan.
Funny you mention it. This thread came up solely because a friend of mine is knitting me some royal blue popcorn tops. She called Sunday to let me know that she just wouldn't be able to get them done in time.
I'm currently working on some RB ones as well, with white cables that cross each other in Xs all up the leg. I call them "Saltire Socks", because that's what they look like.
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