Slip stitch crochet mittens: Rows of back loop only alternating with inverse front loop only, and a cuff of back loop only, which looks exactly the same as the rest of the mitten…
I made them a little too short, so then (afterwards) I added an extra five stitches to each row.

The colours look something like in the second picture (green and grey), and not really like in the outdoor pictures where the low mid-winter sun has made them almost brown!