I use neutral unless I can get a good match.

I use white and neutral cream. I have black, but never use it. I always feel sort of funny that I don't have very many spools of thread, but it would seem like a waste to me. - Cynthia

It is my preferred colour for piecing as grays one into every colour. I don't use black or white as white shows too easily and black is so darned hard to sew with :thumbdown:

I mainly use white or medium grey, sometimes black for piecing.
I buy colors for quilting and regular sewing.