When you click on this interesting mitten post, be sure and scroll down and see that she used roving for all the rainbow dots and left chunks of the roving on the side of the mittens for warmth. She calls them "thrums," which is a new word for me.
There's a photo of the mittens inside-out.
My original reaction to these mittens was that they look big, like oven mitts. Well, that roving is the reason why.
Yes, I think we can easily do this on the machine. Hmm. So many ideas, so little time!