Here is a tutorial for a three-colour cast on, using one colour as edging and alternating 2 colours for the loops. It's useful for fair-isle patterns that start straight away, or for twined knitting.
by Crabapple Hill Studio
by Artesd'Olga
by Tuteate
by Knit Purl Hunter
by Garnstudio DROPS Design
by knit67
by