Right now the guild name color is green; I see all other guild names' color is white. How is this determined. Thx.
Your guildname appears green because it belongs to you. To everybody else who is not in your guild it appears white. The same goes for the other people's guildnames, to them their guildname appears green but yours appear white.
Guildnames appear blue for friends who are in another guild.
Your guildname appears green because it belongs to you. To everybody else who is not in your guild it appears white. The same goes for the other people's guildnames, to them their guildname appears green but yours appear white.