There are flag proposals and flag ideas for Latvian flag. Presented are only proposals and ideas diferent from official Latvian flag Research for colors and flag for latvians began in end of 19th century.
Ideas mostly come from Livonian chronicles.
The idea come from Latvian traditional ornaments of cloth and dresses. M.Silins drawing is something generalized from all ornaments. He propose green or blue coloring - I've drawn only one. Kurzeme, Zemgale, Vidzeme, Latgale. If I don't remember wrong the proposal was reported as vawed line meaning the main river of the country.