First, I measured my hand, then made a pattern that is about 50% wider and longer than the finished mitten should be.
Merino and silk blend roving from The Fibre Garden. Note at this point the thumb is pointed up so that all the rest can be covered.
Then two layers (opposite directions) of roving were placed over the plastic wrap to cover one side of the thumb.
Let them dry and voila! Warm and interesting mittens. Not bad for a first pair.