Two Color Seed Stitch - Two Tone Knitting - 2 Color Knit Stitches - YouTube
Ravelry: B&M Baby Two Tone
Scheepjes Stone Washed Red Cotton Blend Two Tone Yarn 50g - Etsy
Color Theory 101: selecting yarns that go together - Shiny Happy World
How to knit a gradual colour change effect using two strands held together – The Knitting Times
Amazon.com: Cotton to The Core Medium Weight Extra Soft Baby Cotton Blend Yarn for Knitting Crocheting Blankets, Two-Tone, 3 Skeins, 654yds/300g (Blueberry Blue)
Herrschners Two Tone Twist yarn, Twist Delta, lot of 2 (196 yds each) | eBay
Create Marled Yarn with Chain Plying — With Wool
My Baby Wool Silk Cashmere Blend Two Tone Green Ombre Yarn 3 Skeins News | eBay