I started knitting one round with a different yarn each time but soon tired of that. As this is garter stitch, I switched to slip every second stitch in the knit round to get a more textured effect and to distribute the colours better. Occasionally I threw in a normal knit round which worked quite well.
I like the effect of the "floats" on the reverse. The tam would work either way and could, conceivably, be a reversable garment.
Technically this is not a good piece, but I'm so enamoured of the colours and the texture, I'm forgiving myself the very amateurish yarn changes.