This is a Direct response to the Guild hall upgrades topic posted by severage here: http://forums.spiralknights.com/en/node/40011
-I mainly am going to simplify some of his ideas as they could be seen more practically in the future.
1. Mission Center - So right off the bat I removed the idea of guildhall elevators, just seems very complex to fathom that (possibly, although unrealistically) every guild in existence could have them and have them supported. However why not replace that notion with the upcoming mission center. Instead of a fully fledged large gate access have a portable mission center within your guildhall.
2. Interact-able Decorations - Many decorations would be place-able around the guild hall such as chairs and benches, maybe a throne, but you would be able to click on them and automatically sit in them. Also capitalizing on the idea for guild showcases, it would be cool to have Mannequins where guildies could display there sets of gear, it would only show them kind of a monument to their success, the owner of the mannequin would still be able to run around in the gear displayed.
3. Guild Crest - Capitalizing on the idea of guild crests that imbue all decorations placed in your guild hall. But lets dumb it down a lot. For a marginal cost you could see your Guild Hall Manager (a stranger) and choose a 3 layered design a mesh of many different logos and colors. Guild tabards, imbued with your guild crest, would be purchasable but it would be an accessory that attaches to your armor as sev stated.
4. Location Themes - Set overall re-theme ability for your hall, so instead of the default theme there could be an FSC theme, Graveyard theme, Treasure Vault theme.
5. Auction House Courier Stall - Just a stranger in a stall near your alchemy station that allows direct access to the auction house
---Edit---
Addressing the visiting systems and bulletin board systems. While the visiting system i do not contest to, i felt it was unnecessary and a guild hall should be a special meeting hall for members only or else it defeats the purpose. One day you'd end up in your guild hall and all your fresh recruits will be showing up in your hall with their invited hall showing off all the fancy things within. Then you'd end up with a room full of beggars asking for cr and ce.
As far as the bulletin board I think a simply daily guild message that broadcast on login (much like wow) should suffice.
Revisiting my gripe with the guild elevators sev made a list of really cool guild achievements which i was fond of but they all derived from guild elevator access so I've taken the liberty of retooling them.
1. (Baby Steps) Complete an entire Tier 1 expedition, following the defeat of Snarbolax or Rabid Snarbolax, while delving with a full guild party. (30)
2. (Skip, Hop and a Jump) Complete an entire Tier 2 expedition, following the defeat of Jelly King, Ice Queen, Roarmulus Twins, or Red Roarmulus Twins. while delving with a full guild party. (40)
3. (Clockworks Juggernaut) Complete an entire Tier-3 expedition, following the defeat of Vanaduke or Darkfire Vanaduke, while delving with a full guild party. (45)
-You'll also note i disregard the guild vault, seems pointless when all knights have unlimited inventory space. But it might be more sensible to have an option to donate to guild which would go strait to the Guild Hall Manager for later purchases.
-All of these features would have to be purchasable add-ons of course from your Guild Hall Manager.
-Decorations would most likely be purchased from some new npc who could occupy a space in the bazaar near Bechamel.
Side Note: It might be really cool if they implemented a guild leveling system with some type of passive reward (yes like wow)
At the top of this post is a link to the source post. There you can find a detailed and different opinion of many ideas for guildhalls.
Good simplification, a lot quicker and easier to read hope all these good ideas get put into the game because as a guild master id like to do something with my guild hall.