After viewing the page of the Frostwolf Clan (horde guild), I realized that was exactly what I was looking for. But, I was already Alliance. I decided to start <The League of Arathor>. Objectives of the guild are mainly to be a World-PvP guild, but also to allow for a friendly social environment for everyone in the guild.
I have had chats with fellow alliance PvP guild leaders and we will be working with them on future raids. I am also trying to get in contact with the leader of the Frostwolf Clan in order to set up large scale battles between our forces. (Once I have had a chat with the leader of the Frostwolf Clan, I will update this post). Expect for there to be large scale planned World-PvP battles in the future with our allies fighting the Horde.
If this is something that interests you, message me or any member in the guild for a guild invitation.