After reading the "Why do you love DDO" thread, and the general consensus being that people are proud members of their guilds, here's a thought:
Why not provide more to guilds?
For example - we will be getting guild housing some time this year. AWESOME. Very cool and much, much needed.
Next, how about supporting guilds more? Here are some thoughts ...
Guild Coat of Arms
Either a cloak, surcoat or perhaps even a baldric (which must be visible) that guild members wear that has their guild's coat of arms on it. Guildies could be "pimping" their guild's colors and letting the world know "Hey, I'm a member of the Knights of the Squared Horseshoe and PROUD!"
I've got more ideas, but limited time. Let's see what everyone thinks of this one to start.