Not permanent DDDD:
I suggest to make a votum every month, and send the forum link to all players as PM, would increase the relyability of the result .-.
And also determine certain dates where you upload specific banners, eg: green one on St. Paddy's day, 25- October a banner with huge Hammer and Sickle in the eagles hand, (all players running around in heraldic dress with peasant stuff and sickles (free russia ftw), Red-white-Red on 26. October (free austria ftw), White bg at beginning of the winter, yellow at beginning of spring, etc...