I beleive that they should introduce more "Customizability" into the guild, sure you can get a cape, and a hall...and npc's but really there are really only one thing that you can truly customize.
If they introduced an armor NPC (would cost 100k) You could talk to him and design armor for your guild, like Anet could give you a cetain option of things to combine. Such as putting Spikes on a Pot helmet or something to mix it up a bit, and you could put your guild emblem somewhere on your armor and all that jazz.
The armor collectore would offer all different kinds of armor 750g armor, 1.5k, 15k there could be certain designs for each one 15k being most intricate and 750g not being as pretty.
Well, that's about it for my idea ciao.
V

. Seriously how many level 20's don't have max armor excluding the guys in pre-searing getting the waste of time title Defender of Ascalon title.