Russian Winter Mittens
This pattern is very knitter-friendly, and will be great even for a beginner.
There are absolutely no long yarn floats.
The same symmetrical pattern knit on both sides of the mitten.
Two charts (for 56 and 60 stitches) available for a mitten body, and 4 charts - for the thumbs (24 and 26 stitches, different length).
You will also need my Braided Trim tutorial (available free).