Some quick suggestion;

1.Guild Logo.
-Shown like this; (Logo)(Guild Name) in leaderboard.
-Customise guild logo in one new npc in guildhall. (Azen, Guild Banner Designer)
-Each Logo require 25 plat. (Free for first change only)

2.Guild Mode.
-We should have a raid zone with 15< players. (Like Arcanax)
-I can see player enjoying killing a boss when theres many people presented.(bet me)
-Total damage dealt shown in damage ranking. Highest damage gets higher reward and labeled as "MVP".

3.Guild Level.
-I think having guild level is actually fun so that we can level up our guild together. Having to only be ranked by our aps is old fashioned way.
-In addition to guild level, there'll be many new activity such as;
-Every 100 kills of guildmate gives +2/1,000 guild level to move to level 2.
-Every 50 boss killed gives +5/1,000.

4.Guild Gift.
-I know sts won't like this because in their perspective, this is an illegal activity.
-We should be able to gift our guildmate.(except gold)
i)egg
ii)locked
iii)weapon
iv)elixir
-these type of items, which is gifted, will be bound after guildmate received it.