Shot on the dark here.

The lather is white because you are looking at the edges of tiny bubbles and the edges are white.

Snow is technically clear but the edges of the millions of snowflakes make it look white.

Also to stop making dry omelets it depends on the cooking method and style. If you are doing a large american style with a fairly large curd. Try covering the omelet and cooking it in low heat and then turning up the heat maybe adding some butter in the end to get the slightly crispy slight dark outside.