I’m an intermediate knitter. I want to design an intarsia running shoe and wings for a V neck sweater for my runner husband. My question is, must I start a new color only on a knit row, as a friend told me, therefore requiring two rows, or an even number of rows, for each color? I don’t think I want to do the design in duplicate stitch. Thank you in advance for the help I’m sure I’ll get on this.