I recently played in a historical live-action roleplaying game about the Russians and British in colonial India. It got me curious about the history of Siberian independence movements (in the game, I started one, and courted British support in breaking away from Moscow). Apparently in 1917, a "Siberian National Banner" was chosen, and this is what it looked like:
Kazantzev, who designed it, said: "The National Siberian Banner shall be a combination of 2 colours: white and green. White colour means Siberian snow, whilst green colour - Siberian taiga. The banner shall be rectangular, split into 2 parts diagonally from the left top to right bottom. Thus, the upper triangle shall be of green colour, and the lower one - of white colour."
I agree that green and white is a good color scheme for Siberia, but I think a more symmetrical design would've looked better.