I'm sure the photo below looks very, very 'wrong'. All those crossed threads! Goes against everything most people have been told about good practice.
Thing is, if you know and understand your materials, you know just how far you can bend the rules and still get the results you desire.
Now everyone knows I'm all about the efficiency. In the photo below, you can plainly see that for one third of the warp the two colours are a) ABABAB, then b) AABBAABB then AAAABBBB.
Since winding one end of one colour then one end of the next, or even four and four is a bit of a pain, what I do instead is simply wind both colours at once (with a finger between them to minimize twisting, although many people say they don't bother and everything is fine), then when it comes to threading, I just manipulate the colours to be in the sequence I want them in.
The yarn is a highly textured rayon, very slippery. The less I mess with it in the warp winding the happier it, and I, will be.
Currently reading Boar Island by Nevada Barr