Here's a lively swatch from The Alpaca Yarn Company.
Yarn: Swizzle, 100% Superfine Alpaca, in color 07 Tiger Lily. Of course since this is Alpaca, it is SUPER soft and feels great to touch. Swizzle in this colorway is a black ply spun together with a tonally-dyed red/orange/gold ply. Due to the combination of colors and plying, the woven structure of the square is not obvious, so it creates an interesting visual texture which mimicks tracking. If you want to make a project where the outlines of the squares are less obvious, this yarn and colorway would be a good choice.