I feel like there should be more to being in a guild decoration wise.
Maybe like when you join a guild (I am in Crimson Knights, for example) there maybe should be little flags that are around my armory and buildings that have Crimson Knight's logos on them.
Maybe also (This is kind of big) you can change the color of units to match your guild's color. This won't really affect game play but it is just an idea that I wanted to throw out there.
Thanks for reading.