Here's a suggestion for a new Washington State flag.  It represents the three major environments of the state:  The green is for the evergreen forests that predominate the region west of the Cascade Range--a snow-covered mountain spine that runs from the Canadian border in the north to Oregon in the south--which is represented by the white bar. The gold represents the agricultural harvest of the great eastern region.  The Western hemlock has been the official Washington state tree since 1947.

I'm not entirely comfortable with the design, but I think the concept is more interesting and descriptive than the current state flag.