Have any guilds given any thought to this yet? The color customizations are a bit pricey, but we will probably spring for it anyway. If other guilds are doing it, it might be nice to list the color schemes just to get an idea of what others are doing. I don't care much if another guild takes the same colors we use, but I'd like to avoid duplicating someone else if possible.
I haven't polled my guild yet, but I'm thinking blue and white right now to get close to "Silver".
Customizations here: http://ddowiki.com/page/Guild_Airships